diff --git a/doc/concepts/extern.md b/doc/concepts/extern.md
index 3b269122..171d8c58 100644
--- a/doc/concepts/extern.md
+++ b/doc/concepts/extern.md
@@ -1,45 +1,42 @@
 # External Art
 When you need to use a module, overlay, or pass a value from one of your inputs
-to the rest of your NixOS configuration, [extern][extern] is where you do it.
+to the rest of your NixOS configuration, you can make use of a couple arguments.
+It is encouraged to add external art directly in your `flake.nix` so the file
+represents a complete dependency overview of your flake.
 
-Modules and overlays are self explanatory, and the `specialArgs` attribute is
-used to extend the arguments passed to all NixOS modules, allowing for
-arbitrary values to be passed from flake inputs to the rest of your
-configuration.
+## Overlays
+External overlays can directly be added to a channel's `overlays` list.
 
-## Home Manager
-There is also an `hmModules` attribute set for pulling home-manager modules in
-from the outside world:
-
-### Declare:
 flake.nix:
 ```nix
 {
-  inputs.doom-emacs.url = "github:vlaci/nix-doom-emacs";
+  channels.nixos.overlays = [ inputs.agenix.overlay ];
 }
 ```
+These overlays will be automatically filtered by inspecting the `inputs` argument.
 
-extern/default.nix:
+## Modules
+There is a dedicated `nixos.hostDefaults.externalModules` argument for external
+modules.
+
+flake.nix:
 ```nix
-with inputs;
 {
-  hmModules = {
-    doom-emacs = doom-emacs.hmModule;
-  };
+  nixos.hostDefaults.externalModules = [ inputs.agenix.nixosModules.age ];
 }
 ```
 
-### Use:
-users/nixos/default.nix:
+## Home Manager
+Since there isn't a `hosts` concept for home-manager, externalModules is just a
+top-level argument in the `home` namespace.
+
+flake.nix:
 ```nix
-{ hmModules, ... }:
 {
-  home-manager.users.nixos = {
-    imports = [ hmModules.doom-emacs ] ;
-
-    programs.doom-emacs.enable = true;
-  };
+  home.externalModules = [ doom-emacs = doom-emacs.hmModule ];
 }
 ```
 
-[extern]: https://github.com/divnix/devos/tree/core/extern/default.nix
+> ##### Note:
+> The optimal solution would be to automatically export modules that were created in
+> your flake. But this is not possible due to NixOS/nix#4740.
diff --git a/doc/concepts/hosts.md b/doc/concepts/hosts.md
index 0a74dd12..1fa90284 100644
--- a/doc/concepts/hosts.md
+++ b/doc/concepts/hosts.md
@@ -15,6 +15,11 @@ attribute to the name of the file minus the _.nix_ extension. This is for
 convenience, since `nixos-rebuild` automatically searches for a configuration
 matching the current systems hostname if one is not specified explicitly.
 
+You can set channels, systems, and add extra modules to each host by editing the
+`nixos.hosts` argument in flake.nix. This is the perfect place to import
+host specific modules from external sources, such as the
+[nixos-hardware][nixos-hardware] repository.
+
 It is recommended that the host modules only contain configuration information
 specific to a particular piece of hardware. Anything reusable across machines
 is best saved for [profile modules](./profiles.md).
@@ -22,20 +27,29 @@ is best saved for [profile modules](./profiles.md).
 This is a good place to import sets of profiles, called [suites](./suites.md),
 that you intend to use on your machine.
 
-Additionally, this is the perfect place to import anything you might need from
-the [nixos-hardware][nixos-hardware] repository.
-
-> ##### _Note:_
-> Set `nixpkgs.system` to the architecture of this host, default is "x86_64-linux".
-> Keep in mind that not all packages are available for all architectures.
 
 ## Example
 
+flake.nix:
+```nix
+{
+  nixos.hosts = mkMerge [
+    (devos.lib.importHosts ./hosts)
+    {
+      librem = {
+        channelName = "latest";
+        modules = [ hardware.purism-librem-13v3 ];
+      };
+    }
+  ];
+}
+```
+
 hosts/librem.nix:
 ```nix
-{ suites, hardware, ... }:
+{ suites, ... }:
 {
-  imports = suites.laptop ++ [ hardware.purism-librem-13v3 ];
+  imports = suites.laptop;
 
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
diff --git a/doc/concepts/overrides.md b/doc/concepts/overrides.md
index 28194cd1..0eb1002e 100644
--- a/doc/concepts/overrides.md
+++ b/doc/concepts/overrides.md
@@ -1,47 +1,36 @@
 # Overrides
-By default, the NixOS systems are based on unstable. While it is trivial to
-change this to a stable release, or any other branch of nixpkgs by
-changing the flake url, sometimes all we want is a single package from another
-branch.
+Each NixOS host follows one channel. But many times it is useful to get packages
+or modules from different channels.
 
-This is what the overrides are for. By default, they are pulled directly from
-nixpkgs/master, but you can change the `override` flake input url to
-nixos-unstable, or even a specific sha revision.
+## Packages
+You can make use of `overlays/overrides.nix` to override specific packages in the
+default channel to be pulled from other channels. That file is simply an example
+of how any overlay can get `channels` as their first argument.
 
-They are defined in the `extern/overrides.nix` file.
+You can add overlays to any channel to override packages from other channels.
 
-## Example
-
-### Packages
-The override packages are defined as a regular overlay with an extra arguement
-`pkgs`. This refers to the packages built from the `override` flake.
-
-Pulling the manix package from the override flake:
+Pulling the manix package from the `latest` channel:
 ```nix
-{
-  packages = pkgs: final: prev: {
-    inherit (pkgs) manix;
-  };
+channels: final: prev: {
+  inherit (pkgs.latest) manix;
 }
 ```
 
-### Modules
+## Modules
 
-You can also pull modules from override. Simply specify their path relative to
-the nixpkgs [modules][nixpkgs-modules] directory. The old version will be added
-to `disabledModules` and the new version imported into the configuration.
+You can also pull modules from other channels. All modules have access to the 
+`modulesPath` for each channel as `<channelName>ModulesPath`. And you can use
+`disabledModules` to remove modules from the current channel.
 
-Pulling the zsh module from the override flake:
+Pulling the zsh module from the `latest` channel:
 ```nix
-{
-  modules = [ "programs/zsh/zsh.nix" ];
+{ latestModulesPath }: {
+  modules = [ "${latestModulesPath}/programs/zsh/zsh.nix" ];
+  disabledModules = [ "programs/zsh/zsh.nix" ];
 }
 ```
 
 > ##### _Note:_
-> Sometimes a modules name will change from one branch to another. This is what
-> the `disabledModules` list is for. If the module name changes, the old
-> version will not automatically be disabled, so simply put it's old name in
-> this list to disable it.
+> Sometimes a modules name will change from one branch to another.
 
 [nixpkgs-modules]: https://github.com/NixOS/nixpkgs/tree/master/nixos/modules
diff --git a/doc/concepts/suites.md b/doc/concepts/suites.md
index e6a8bff7..5c0d5909 100644
--- a/doc/concepts/suites.md
+++ b/doc/concepts/suites.md
@@ -6,7 +6,13 @@ profiles. For good examples, check out the suites defined in the community
 In the future, we will use suites as a mechanism for deploying various machine
 types which don't depend on hardware, such as vm's and containers.
 
-They are defined in `profiles/suites.nix`.
+They are defined with the `suites` argument in either `home` or `nixos` namespace.
+Suites should be passed as a function that take profiles as an argument.
+
+The profiles are passed based on the folder names and list passed to the relevant
+`profiles` argument. In the template's flake.nix `profiles` is set as
+`[ ./profiles ./users ]` and that corresponds to the `{ profiles, users }` argument
+pattern.
 
 ## Definition
 ```nix
diff --git a/doc/mkFlakeOptions.md b/doc/mkFlakeOptions.md
new file mode 100644
index 00000000..90719ba1
--- /dev/null
+++ b/doc/mkFlakeOptions.md
@@ -0,0 +1,407 @@
+## channels
+nixpkgs channels to create
+
+
+*_Type_*:
+attribute set of submodules
+
+
+*_Default_*
+```
+{}
+```
+
+
+
+
+## channels.\<name\>.config
+nixpkgs config for this channel
+
+
+*_Type_*:
+attribute set or path convertible to it
+
+
+*_Default_*
+```
+{}
+```
+
+
+
+
+## channels.\<name\>.input
+nixpkgs flake input to use for this channel
+
+
+*_Type_*:
+nix flake
+
+
+*_Default_*
+```
+"inputs.<name>"
+```
+
+
+
+
+## channels.\<name\>.overlays
+overlays to apply to this channel
+these will get exported under the 'overlays' flake output
+as \<channel\>/\<name\> and any overlay pulled from ${inputs}
+will be filtered out
+
+
+*_Type_*:
+list of valid Nixpkgs overlay or path convertible to its or anything convertible to it
+
+
+*_Default_*
+```
+[]
+```
+
+
+
+
+## channelsConfig
+nixpkgs config for all channels
+
+
+*_Type_*:
+attribute set or path convertible to it
+
+
+*_Default_*
+```
+{}
+```
+
+
+
+
+## home
+hosts, modules, suites, and profiles for home-manager
+
+
+*_Type_*:
+submodule
+
+
+*_Default_*
+```
+{}
+```
+
+
+
+
+## home.externalModules
+modules to include that won't be exported
+meant importing modules from external flakes
+
+
+*_Type_*:
+list of valid module or path convertible to its
+
+
+*_Default_*
+```
+[]
+```
+
+
+
+
+## home.modules
+modules to include in all hosts and export to homeModules output
+
+
+*_Type_*:
+list of path to a modules or anything convertible to it or path convertible to it
+
+
+*_Default_*
+```
+[]
+```
+
+
+
+
+## home.profiles
+profile folders that can be collected into suites
+the name of the argument passed to suites is based
+on the folder name.
+[ ./profiles ] => { profiles }:
+
+
+*_Type_*:
+list of paths
+
+
+*_Default_*
+```
+[]
+```
+
+
+
+
+## home.suites
+Function that takes profiles and returns suites for this config system
+These can be accessed through the 'suites' special argument.
+
+
+*_Type_*:
+function that evaluates to a(n) attrs or path convertible to it
+
+
+*_Default_*
+```
+"<function>"
+```
+
+
+
+
+## inputs
+inputs for this flake
+used to set channel defaults and create registry
+
+
+*_Type_*:
+attribute set of nix flakes
+
+
+
+
+
+
+## nixos
+hosts, modules, suites, and profiles for nixos
+
+
+*_Type_*:
+submodule
+
+
+*_Default_*
+```
+{}
+```
+
+
+
+
+## nixos.hostDefaults
+Defaults for all hosts.
+the modules passed under hostDefaults will be exported
+to the 'nixosModules' flake output.
+They will also be added to all hosts.
+
+
+*_Type_*:
+submodule
+
+
+*_Default_*
+```
+{}
+```
+
+
+
+
+## nixos.hostDefaults.channelName
+Channel this host should follow
+
+
+*_Type_*:
+a channel defined in `channels`
+
+
+*_Default_*
+```
+null
+```
+
+
+
+
+## nixos.hostDefaults.externalModules
+modules to include that won't be exported
+meant importing modules from external flakes
+
+
+*_Type_*:
+list of valid module or path convertible to its
+
+
+*_Default_*
+```
+[]
+```
+
+
+
+
+## nixos.hostDefaults.modules
+modules to include in all hosts and export to nixosModules output
+
+
+*_Type_*:
+list of path to a modules or anything convertible to it or path convertible to it
+
+
+*_Default_*
+```
+[]
+```
+
+
+
+
+## nixos.hostDefaults.system
+system for this host
+
+
+*_Type_*:
+system defined in `supportedSystems`
+
+
+*_Default_*
+```
+null
+```
+
+
+
+
+## nixos.hosts
+configurations to include in the nixosConfigurations output
+
+
+*_Type_*:
+attribute set of submodules
+
+
+*_Default_*
+```
+{}
+```
+
+
+
+
+## nixos.hosts.\<name\>.channelName
+Channel this host should follow
+
+
+*_Type_*:
+a channel defined in `channels`
+
+
+*_Default_*
+```
+null
+```
+
+
+
+
+## nixos.hosts.\<name\>.modules
+modules to include
+
+
+*_Type_*:
+list of valid module or path convertible to its or anything convertible to it
+
+
+*_Default_*
+```
+[]
+```
+
+
+
+
+## nixos.hosts.\<name\>.system
+system for this host
+
+
+*_Type_*:
+system defined in `supportedSystems`
+
+
+*_Default_*
+```
+null
+```
+
+
+
+
+## nixos.profiles
+profile folders that can be collected into suites
+the name of the argument passed to suites is based
+on the folder name.
+[ ./profiles ] => { profiles }:
+
+
+*_Type_*:
+list of paths
+
+
+*_Default_*
+```
+[]
+```
+
+
+
+
+## nixos.suites
+Function that takes profiles and returns suites for this config system
+These can be accessed through the 'suites' special argument.
+
+
+*_Type_*:
+function that evaluates to a(n) attrs or path convertible to it
+
+
+*_Default_*
+```
+"<function>"
+```
+
+
+
+
+## self
+The flake to create the devos outputs for
+
+*_Type_*:
+nix flake
+
+
+
+
+
+
+## supportedSystems
+The systems supported by this flake
+
+
+*_Type_*:
+list of strings
+
+
+*_Default_*
+```
+["aarch64-linux","i686-linux","x86_64-darwin","x86_64-linux"]
+```
+
+
+
diff --git a/doc/outputs/overlays.md b/doc/outputs/overlays.md
index d71b4597..f463d1a7 100644
--- a/doc/outputs/overlays.md
+++ b/doc/outputs/overlays.md
@@ -4,7 +4,7 @@ we want to keep the process as simple and straightforward as possible.
 
 Any _.nix_ files declared in this directory will be assumed to be a valid
 overlay, and will be automatically imported into all [hosts](../concepts/hosts.md), and
-exported via `overlays.<file-basename>` _as well as_
+exported via `overlays.<channel>/<pkgName>` _as well as_
 `packages.<system>.<pkgName>` (for valid systems), so all you have to do is
 write it.
 
diff --git a/doc/start/from-nixos.md b/doc/start/from-nixos.md
index bbb0e551..9b0b3f57 100644
--- a/doc/start/from-nixos.md
+++ b/doc/start/from-nixos.md
@@ -10,10 +10,18 @@ flk up
 This will make a new file `hosts/up-$(hostname).nix`, which you can edit to
 your liking.
 
+You must then add a host to `nixos.hosts` in flake.nix:
+```nix
+{
+  nixos.hosts = {
+    modules = hosts/NixOS.nix;
+  };
+}
+```
+
 Make sure your `i18n.defaultLocale` and `time.timeZone` are set properly for
 your region. Keep in mind that `networking.hostName` with be automatically
-set to the filename of your hosts file, so `hosts/my-host.nix` will have the
-hostname `my-host`.
+set to the name of your host;
 
 Now might be a good time to read the docs on [suites](../concepts/suites.md) and
 [profiles](../concepts/profiles.md) and add or create any that you need.
diff --git a/doc/tests.md b/doc/tests.md
index 033d75af..f6fd7fe9 100644
--- a/doc/tests.md
+++ b/doc/tests.md
@@ -7,7 +7,7 @@ configuration, and, optionally, run them in
 
 ## Lib Tests
 You can easily write tests for your own library functions in the
-___tests/lib.nix___ file and they will be run on every `nix flake check` or
+lib/___tests/lib.nix___ file and they will be run on every `nix flake check` or
 during a CI run.
 
 ## Unit Tests
diff --git a/extern/default.nix b/extern/default.nix
deleted file mode 100644
index 19c1bae6..00000000
--- a/extern/default.nix
+++ /dev/null
@@ -1,25 +0,0 @@
-{ inputs }: with inputs;
-{
-  modules = [
-    home.nixosModules.home-manager
-    ci-agent.nixosModules.agent-profile
-  ];
-
-  overlays = [
-    nur.overlay
-    pkgs.overlay
-  ];
-
-  # passed to all nixos modules
-  specialArgs = {
-    overrideModulesPath = "${override}/nixos/modules";
-    hardware = nixos-hardware.nixosModules;
-  };
-
-  # added to home-manager
-  userModules = [
-  ];
-
-  # passed to all home-manager modules
-  userSpecialArgs = { };
-}
diff --git a/extern/overrides.nix b/extern/overrides.nix
deleted file mode 100644
index 78e6ee85..00000000
--- a/extern/overrides.nix
+++ /dev/null
@@ -1,33 +0,0 @@
-# override defaults to nixpkgs/master
-{
-  # modules to pull from override, stable version is automatically disabled
-  modules = [ ];
-
-  # if a modules name changed in override, add the old name here
-  disabledModules = [ ];
-
-  # packages pulled from override
-  packages = pkgs: final: prev: {
-    inherit (pkgs)
-      cachix
-      dhall
-      discord
-      element-desktop
-      manix
-      nixpkgs-fmt
-      qutebrowser
-      signal-desktop
-      starship;
-
-    haskellPackages = prev.haskellPackages.override {
-      overrides = hfinal: hprev:
-        let version = prev.lib.replaceChars [ "." ] [ "" ] prev.ghc.version;
-        in
-        {
-          # same for haskell packages, matching ghc versions
-          inherit (pkgs.haskell.packages."ghc${version}")
-            haskell-language-server;
-        };
-    };
-  };
-}
diff --git a/flake.lock b/flake.lock
index 1c95e54a..91c20fdd 100644
--- a/flake.lock
+++ b/flake.lock
@@ -12,7 +12,7 @@
           "nixos"
         ],
         "nixos-unstable": [
-          "override"
+          "latest"
         ],
         "pre-commit-hooks-nix": "pre-commit-hooks-nix"
       },
@@ -33,7 +33,7 @@
     "darwin": {
       "inputs": {
         "nixpkgs": [
-          "override"
+          "latest"
         ]
       },
       "locked": {
@@ -81,7 +81,7 @@
         "utils": "utils_2"
       },
       "locked": {
-        "narHash": "sha256-t14TKUtw83dZ2mbqjRpeUvdAx4zpe/ySr5KhPhB1JMU=",
+        "narHash": "sha256-hpvEXcpq85cDKi0F5UUsuMVISKlk8hgVJiz5FF29RwA=",
         "path": "./lib",
         "type": "path"
       },
@@ -138,6 +138,21 @@
         "type": "github"
       }
     },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1619345332,
+        "narHash": "sha256-qHnQkEp1uklKTpx3MvKtY6xzgcqXDsz5nLilbbuL+3A=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "2ebf2558e5bf978c7fb8ea927dfaed8fefab2e28",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "home": {
       "inputs": {
         "nixpkgs": [
@@ -158,10 +173,24 @@
         "type": "github"
       }
     },
+    "latest": {
+      "locked": {
+        "lastModified": 1619400530,
+        "narHash": "sha256-7ZO7B+b9i1wFbHw62EFT+iwuBBpXeA/fcHlR63Z4J0w=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e8dc8adab655eb27957859c62bef11484b53f639",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
     "naersk": {
       "inputs": {
         "nixpkgs": [
-          "override"
+          "latest"
         ]
       },
       "locked": {
@@ -182,7 +211,7 @@
     "naersk_2": {
       "inputs": {
         "nixpkgs": [
-          "override"
+          "latest"
         ]
       },
       "locked": {
@@ -259,20 +288,6 @@
         "type": "indirect"
       }
     },
-    "override": {
-      "locked": {
-        "lastModified": 1615926763,
-        "narHash": "sha256-yeq8A3EPNuQVlsxlEQrIRsklfJwJK0Us6jtcG/u8wNs=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "b702a56d417647de4090ac56c0f18bdc7e646610",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "type": "indirect"
-      }
-    },
     "pkgs": {
       "inputs": {
         "nixpkgs": [
@@ -312,11 +327,11 @@
         "devos": "devos",
         "flake-compat": "flake-compat_2",
         "home": "home",
+        "latest": "latest",
         "naersk": "naersk_2",
         "nixos": "nixos",
         "nixos-hardware": "nixos-hardware",
         "nur": "nur",
-        "override": "override",
         "pkgs": "pkgs"
       }
     },
@@ -336,17 +351,21 @@
       }
     },
     "utils_2": {
+      "inputs": {
+        "flake-utils": "flake-utils"
+      },
       "locked": {
-        "lastModified": 1618868421,
-        "narHash": "sha256-vyoJhLV6cJ8/tWz+l9HZLIkb9Rd9esE7p+0RL6zDR6Y=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "eed214942bcfb3a8cc09eb3b28ca7d7221e44a94",
+        "lastModified": 1619532520,
+        "narHash": "sha256-+xIFAW5J0AcxwAflAX1gg/C8kfaqeZbS4XAZusCrZPY=",
+        "owner": "gytis-ivaskevicius",
+        "repo": "flake-utils-plus",
+        "rev": "8eb7f9206713a528174c20c5133521dc37e2bfb1",
         "type": "github"
       },
       "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
+        "owner": "gytis-ivaskevicius",
+        "ref": "staging",
+        "repo": "flake-utils-plus",
         "type": "github"
       }
     }
diff --git a/flake.nix b/flake.nix
index bad78f1f..1b469f48 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,7 +4,7 @@
   inputs =
     {
       nixos.url = "nixpkgs/nixos-unstable";
-      override.url = "nixpkgs";
+      latest.url = "nixpkgs";
       devos.url = "path:./lib"; # TODO: outfactor into separate repo
       devos.inputs = {
         nixpkgs.follows = "nixos";
@@ -17,38 +17,71 @@
 
       ci-agent = {
         url = "github:hercules-ci/hercules-ci-agent";
-        inputs = { nix-darwin.follows = "darwin"; flake-compat.follows = "flake-compat"; nixos-20_09.follows = "nixos"; nixos-unstable.follows = "override"; };
+        inputs = { nix-darwin.follows = "darwin"; flake-compat.follows = "flake-compat"; nixos-20_09.follows = "nixos"; nixos-unstable.follows = "latest"; };
       };
       darwin.url = "github:LnL7/nix-darwin";
-      darwin.inputs.nixpkgs.follows = "override";
-      flake-compat.url = "github:BBBSnowball/flake-compat/pr-1";
-      flake-compat.flake = false;
+      darwin.inputs.nixpkgs.follows = "latest";
       home.url = "github:nix-community/home-manager";
       home.inputs.nixpkgs.follows = "nixos";
       naersk.url = "github:nmattia/naersk";
-      naersk.inputs.nixpkgs.follows = "override";
+      naersk.inputs.nixpkgs.follows = "latest";
       nixos-hardware.url = "github:nixos/nixos-hardware";
 
       pkgs.url = "path:./pkgs";
       pkgs.inputs.nixpkgs.follows = "nixos";
     };
 
-  outputs = inputs@{ self, devos, nixos, nur, ... }:
+  outputs = inputs@{ self, pkgs, devos, nixos, ci-agent, home, nixos-hardware, nur, ... }:
     devos.lib.mkFlake {
-      inherit self inputs nixos;
-      hosts = ./hosts;
-      packages = import ./pkgs;
-      suites = import ./profiles/suites.nix;
-      extern = import ./extern;
-      overrides = import ./extern/overrides.nix;
-      overlays = ./overlays;
-      profiles = ./profiles;
-      userProfiles = ./users/profiles;
-      modules = import ./modules/module-list.nix;
-      userModules = import ./users/modules/module-list.nix;
-    } // {
-    defaultTemplate = self.templates.flk;
-    templates.flk.path = ./.;
-    templates.flk.description = "flk template";
-  };
+      inherit self inputs;
+
+      channelsConfig = { allowUnfree = true; };
+
+      channels = {
+        nixos = {
+          overlays = [
+            (devos.lib.pathsIn ./overlays)
+            ./pkgs/default.nix
+            pkgs.overlay # for `srcs`
+            nur.overlay
+          ];
+        };
+        latest = { };
+      };
+
+      nixos = {
+        hostDefaults = {
+          system = "x86_64-linux";
+          channelName = "nixos";
+          modules = ./modules/module-list.nix;
+          externalModules = [
+            ci-agent.nixosModules.agent-profile
+            home.nixosModules.home-manager
+          ];
+        };
+        hosts = nixos.lib.mkMerge [
+          (devos.lib.importHosts ./hosts)
+          { /* set host specific properties here */ }
+        ];
+        profiles = [ ./profiles ./users ];
+        suites = { profiles, users, ... }: with profiles; {
+          base = [ cachix core users.nixos users.root ];
+        };
+      };
+
+      home = {
+        modules = ./users/modules/module-list.nix;
+        externalModules = [ ];
+        profiles = [ ./users/profiles ];
+        suites = { profiles, ... }: with profiles; {
+          base = [ direnv git ];
+        };
+      };
+
+      #defaultTemplate = self.templates.flk;
+      templates.flk.path = ./.;
+      templates.flk.description = "flk template";
+
+    }
+  ;
 }
diff --git a/lib/attrs.nix b/lib/attrs.nix
index 1ecc2544..93f79583 100644
--- a/lib/attrs.nix
+++ b/lib/attrs.nix
@@ -30,6 +30,14 @@ rec {
       value = import path;
     });
 
+  importHosts = dir:
+    lib.os.recImport {
+      inherit dir;
+      _import = base: {
+        modules = import "${toString dir}/${base}.nix";
+      };
+    };
+
   concatAttrs = lib.fold (attr: sum: lib.recursiveUpdate sum attr) { };
 
   # Filter out packages that support given system and follow flake check requirements
@@ -41,5 +49,6 @@ rec {
     in
     lib.filterAttrs filter packages;
 
-  safeReadDir = path: lib.optionalAttrs (builtins.pathExists path) (builtins.readDir path);
+  safeReadDir = path:
+    lib.optionalAttrs (builtins.pathExists (toString path)) (builtins.readDir (toString path));
 }
diff --git a/lib/compat/default.nix b/lib/compat/default.nix
index 0a63b0bc..9d0c2837 100644
--- a/lib/compat/default.nix
+++ b/lib/compat/default.nix
@@ -1,12 +1,10 @@
 let
-  inherit (lock.nodes.flake-compat.locked) rev narHash;
-
-  lock = builtins.fromJSON (builtins.readFile "${../..}/flake.lock");
+  rev = "e7e5d481a0e15dcd459396e55327749989e04ce0";
   flake = (import
     (
       fetchTarball {
         url = "https://github.com/edolstra/flake-compat/archive/${rev}.tar.gz";
-        sha256 = narHash;
+        sha256 = "0zd3x46fswh5n6faq4x2kkpy6p3c6j593xbdlbsl40ppkclwc80x";
       }
     )
     {
diff --git a/lib/devos/devosSystem.nix b/lib/devos/devosSystem.nix
index 00c9e3e6..c48f68a5 100644
--- a/lib/devos/devosSystem.nix
+++ b/lib/devos/devosSystem.nix
@@ -1,31 +1,40 @@
 { lib }:
 
-{ self, nixos, inputs, modules, ... } @ allArgs:
-let args = builtins.removeAttrs allArgs [ "self" "nixos" "inputs" ]; in
-lib.nixosSystem (args // {
-  modules =
-    let
-      moduleList = builtins.attrValues modules;
+# dependencies to return a builder
+{ self, inputs }:
 
-      fullHostConfig = (lib.nixosSystem (args // { modules = moduleList; })).config;
+{ modules, specialArgs, ... } @ args:
+let inherit (specialArgs.channel.input.lib) nixosSystem; in
+nixosSystem
+  (args // {
+    modules =
+      let
+        fullHostConfig = (nixosSystem (args // { inherit modules; })).config;
 
-      isoConfig = (lib.nixosSystem
-        (args // {
-          modules = moduleList ++ [
-            (lib.modules.iso { inherit self nixos inputs fullHostConfig; })
-          ];
-        })).config;
-      hmConfig = (lib.nixosSystem
-        (args // {
-          modules = moduleList ++ [
-            (lib.modules.hmConfig)
-          ];
-        })).config;
-    in
-    moduleList ++ [{
-      system.build = {
-        iso = isoConfig.system.build.isoImage;
-        homes = hmConfig.home-manager.users;
-      };
-    }];
-})
+        isoConfig = (nixosSystem
+          (args // {
+            modules = modules ++ [
+              (lib.modules.iso { inherit self inputs fullHostConfig; })
+            ];
+          })).config;
+
+        hmConfig = (nixosSystem
+          (args // {
+            modules = modules ++ [
+              (lib.modules.hmConfig)
+            ];
+          })).config;
+      in
+      modules ++ [{
+        system.build = {
+          iso = isoConfig.system.build.isoImage;
+          homes = hmConfig.home-manager.users;
+        };
+        lib = {
+          inherit specialArgs;
+          testModule = {
+            imports = modules;
+          };
+        };
+      }];
+  })
diff --git a/lib/devos/mkSuites.nix b/lib/devos/mkSuites.nix
index 66a36ea1..45d8a10f 100644
--- a/lib/devos/mkSuites.nix
+++ b/lib/devos/mkSuites.nix
@@ -1,20 +1,20 @@
 { lib }:
 
-{ users, profiles, userProfiles, suites } @ args:
+{ suites, profiles } @ args:
 let
   inherit (lib) os;
 
-  definedSuites = suites {
-    inherit (args) users profiles userProfiles;
-  };
+  profileSet = lib.genAttrs' profiles (path: {
+     name = baseNameOf path;
+     value = os.mkProfileAttrs (toString path);
+  });
 
-  allProfiles = lib.collectProfiles profiles;
-
-  allUsers = lib.collectProfiles users;
-
-  createSuites = _: suites: lib.mapAttrs (_: v: os.profileMap v) suites // {
-    inherit allProfiles allUsers;
-  };
+  definedSuites = suites profileSet;
 
+  allProfiles = lib.collectProfiles profileSet;
 in
-lib.mapAttrs createSuites definedSuites
+lib.mapAttrs (_: v: os.profileMap v) definedSuites // {
+    inherit allProfiles;
+}
+
+
diff --git a/lib/flake.lock b/lib/flake.lock
index f70c491f..ebf5e6d3 100644
--- a/lib/flake.lock
+++ b/lib/flake.lock
@@ -52,6 +52,21 @@
         "type": "github"
       }
     },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1619345332,
+        "narHash": "sha256-qHnQkEp1uklKTpx3MvKtY6xzgcqXDsz5nLilbbuL+3A=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "2ebf2558e5bf978c7fb8ea927dfaed8fefab2e28",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "naersk": {
       "inputs": {
         "nixpkgs": [
@@ -127,17 +142,21 @@
       }
     },
     "utils_2": {
+      "inputs": {
+        "flake-utils": "flake-utils"
+      },
       "locked": {
-        "lastModified": 1618868421,
-        "narHash": "sha256-vyoJhLV6cJ8/tWz+l9HZLIkb9Rd9esE7p+0RL6zDR6Y=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "eed214942bcfb3a8cc09eb3b28ca7d7221e44a94",
+        "lastModified": 1619532520,
+        "narHash": "sha256-+xIFAW5J0AcxwAflAX1gg/C8kfaqeZbS4XAZusCrZPY=",
+        "owner": "gytis-ivaskevicius",
+        "repo": "flake-utils-plus",
+        "rev": "8eb7f9206713a528174c20c5133521dc37e2bfb1",
         "type": "github"
       },
       "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
+        "owner": "gytis-ivaskevicius",
+        "ref": "staging",
+        "repo": "flake-utils-plus",
         "type": "github"
       }
     }
diff --git a/lib/flake.nix b/lib/flake.nix
index 15d87197..2513311d 100644
--- a/lib/flake.nix
+++ b/lib/flake.nix
@@ -5,7 +5,7 @@
     {
       deploy.url = "github:serokell/deploy-rs";
       devshell.url = "github:numtide/devshell";
-      utils.url = "github:numtide/flake-utils";
+      utils.url = "github:gytis-ivaskevicius/flake-utils-plus/staging";
     };
 
   outputs = inputs@{ self, nixpkgs, deploy, devshell, utils, ... }:
@@ -35,12 +35,11 @@
               inherit deploy;
             };
             evalArgs = import ./mkFlake/evalArgs.nix { lib = nixpkgs.lib // self; };
-            evalOldArgs = import ./mkFlake/evalOldArgs.nix { lib = nixpkgs.lib // self; };
           };
 
           pkgs-lib = import ./pkgs-lib {
             lib = nixpkgs.lib // self;
-            inherit nixpkgs deploy devshell;
+            inherit deploy devshell;
           };
 
           inherit (attrs)
@@ -49,8 +48,9 @@
             safeReadDir
             pathsToImportedAttrs
             concatAttrs
-            filterPackages;
-          inherit (lists) pathsIn collectProfiles;
+            filterPackages
+            importHosts;
+          inherit (lists) pathsIn collectProfiles unifyOverlays;
           inherit (strings) rgxToString;
           inherit modules;
         }
@@ -61,7 +61,7 @@
     {
       lib = utils.lib // {
         inherit (lib)
-          mkFlake;
+          mkFlake pathsIn importHosts;
       };
 
     }
@@ -83,7 +83,7 @@
           mkFlakeDoc = pkgs.writeText "mkFlakeOptions.md"
             (
               pkgs.nixosOptionsDoc {
-                inherit (lib.mkFlake.evalArgs { nixos = "nixos"; args = { }; }) options;
+                inherit (lib.mkFlake.evalArgs { args = { }; }) options;
               }
             ).optionsMDDoc;
         };
diff --git a/lib/lists.nix b/lib/lists.nix
index c20a4d7b..5e9c57b2 100644
--- a/lib/lists.nix
+++ b/lib/lists.nix
@@ -16,4 +16,6 @@
       fullPath = name: "${toString dir}/${name}";
     in
     map fullPath (lib.attrNames (lib.safeReadDir dir));
+
+  unifyOverlays = channels: map (o: if builtins.isFunction (o null null) then o channels else o);
 }
diff --git a/lib/mkFlake/default.nix b/lib/mkFlake/default.nix
index d086283a..bf571ec4 100644
--- a/lib/mkFlake/default.nix
+++ b/lib/mkFlake/default.nix
@@ -1,64 +1,94 @@
 { lib, deploy }:
 let
   inherit (lib) os;
+  inherit (builtins) mapAttrs attrNames attrValues head isFunction;
 in
 
-_: { self, inputs, nixos, ... } @ args:
+_: { self, inputs, ... } @ args:
 let
 
-  cfg = (
-    lib.mkFlake.evalOldArgs
-      { inherit self inputs args; }
-  ).config;
-
-  multiPkgs = os.mkPkgs
-    {
-      inherit self inputs nixos;
-      inherit (cfg) extern overrides;
-    };
-
-  outputs = {
-    nixosConfigurations = os.mkHosts
-      {
-        inherit self inputs nixos multiPkgs;
-        inherit (cfg) extern suites overrides;
-        dir = cfg.hosts;
-      };
-
-    homeConfigurations = os.mkHomeConfigurations self.nixosConfigurations;
-
-    nixosModules = cfg.modules;
-
-    homeModules = cfg.userModules;
-
-    overlay = cfg.packages;
-    inherit (cfg) overlays;
-
-    deploy.nodes = os.mkNodes deploy self.nixosConfigurations;
+  config = lib.mkFlake.evalArgs {
+    inherit args;
   };
 
-  systemOutputs = lib.eachDefaultSystem (system:
-    let
-      pkgs = multiPkgs.${system};
-      pkgs-lib = lib.pkgs-lib.${system};
-      # all packages that are defined in ./pkgs
-      legacyPackages = os.mkPackages {
-        inherit pkgs;
-        inherit (self) overlay overlays;
-      };
-    in
-    {
-      checks = pkgs-lib.tests.mkChecks {
+  cfg = config.config;
+
+  otherArguments = removeAttrs args (attrNames config.options);
+
+  defaultModules = with lib.modules; [
+    (hmDefaults {
+      inherit (cfg.home) suites;
+      modules = cfg.home.modules ++ cfg.home.externalModules;
+    })
+    (globalDefaults {
+      inherit self inputs;
+    })
+  ];
+
+  stripChannel = channel: removeAttrs channel [
+    # arguments in our channels api that shouldn't be passed to fup
+    "overlays"
+  ];
+  getDefaultChannel = channels: channels.${cfg.nixos.hostDefaults.channelName};
+
+  # evalArgs sets channelName and system to null by default
+  # but for proper default handling in fup, null args have to be removed
+  stripHost = args: removeAttrs (lib.filterAttrs (_: arg: arg != null) args) [
+    # arguments in our hosts/hostDefaults api that shouldn't be passed to fup
+    "externalModules"
+  ];
+  hosts = lib.mapAttrs (_: stripHost) cfg.nixos.hosts;
+  hostDefaults = stripHost cfg.nixos.hostDefaults;
+in
+lib.systemFlake (lib.recursiveUpdate
+  otherArguments
+  {
+    inherit self inputs hosts;
+    inherit (cfg) channelsConfig supportedSystems;
+
+    channels = mapAttrs
+      (name: channel:
+        stripChannel (channel // {
+          # pass channels if "overlay" has three arguments
+          overlaysBuilder = channels: lib.unifyOverlays channels channel.overlays;
+        })
+      )
+      cfg.channels;
+
+    hostDefaults = lib.mergeAny hostDefaults {
+      specialArgs.suites = cfg.nixos.suites;
+      modules = cfg.nixos.hostDefaults.externalModules ++ defaultModules;
+      builder = os.devosSystem { inherit self inputs; };
+    };
+
+    nixosModules = lib.exporter.modulesFromList cfg.nixos.hostDefaults.modules;
+
+    homeModules = lib.exporter.modulesFromList cfg.home.modules;
+    homeConfigurations = os.mkHomeConfigurations self.nixosConfigurations;
+
+    deploy.nodes = os.mkNodes deploy self.nixosConfigurations;
+
+    overlays = lib.exporter.overlaysFromChannelsExporter {
+      # since we can't detect overlays owned by self
+      # we have to filter out ones exported by the inputs
+      # optimally we would want a solution for NixOS/nix#4740
+      inherit inputs;
+      inherit (self) pkgs;
+    };
+
+    packagesBuilder = lib.builder.packagesFromOverlaysBuilderConstructor self.overlays;
+
+    checksBuilder = channels:
+      lib.pkgs-lib.tests.mkChecks {
+        pkgs = getDefaultChannel channels;
         inherit (self.deploy) nodes;
         hosts = self.nixosConfigurations;
         homes = self.homeConfigurations;
       };
 
-      inherit legacyPackages;
-      packages = lib.filterPackages system legacyPackages;
-
-      devShell = pkgs-lib.shell;
-    });
-in
-outputs // systemOutputs
-
+    devShellBuilder = channels:
+      lib.pkgs-lib.shell {
+        pkgs = getDefaultChannel channels;
+      };
+  }
+)
diff --git a/lib/mkFlake/evalArgs.nix b/lib/mkFlake/evalArgs.nix
index cb90f614..ee42e224 100644
--- a/lib/mkFlake/evalArgs.nix
+++ b/lib/mkFlake/evalArgs.nix
@@ -1,11 +1,12 @@
 { lib }:
 
-{ nixos, args }:
+{ args }:
 let
   argOpts = with lib; { config, ... }:
     let
       inherit (lib) os;
 
+      cfg = config;
       inherit (config) self;
 
       maybeImport = obj:
@@ -20,6 +21,12 @@ let
         inherit (submodule { }) check;
         description = "valid module";
       });
+
+      # to export modules we need paths to get the name
+      exportModuleType = with types;
+        (addCheck path (x: moduleType.check (import x))) // {
+          description = "path to a module";
+        };
       overlayType = pathTo (types.anything // {
         check = builtins.isFunction;
         description = "valid Nixpkgs overlay";
@@ -33,46 +40,37 @@ let
       # To simplify apply keys and improve type checking
       pathTo = elemType: with types; coercedTo path maybeImport elemType;
 
-      # Accepts single item or a list
-      # apply keys end up with a list
-      # This should not be used if expecting a nested list
-      # all lists will get flattened by this
-      coercedListOf = elemType:
-        let coerceToList = x: flatten (singleton x); in
-        with types; coercedTo elemType coerceToList (listOf elemType);
+      pathToListOf = elemType: with types; pathTo (listOf elemType);
 
-      pathToListOf = x: pathTo (coercedListOf x);
+      coercedListOf = elemType: with types;
+        coercedTo anything (x: flatten (singleton x)) (listOf elemType);
 
       /* Submodules needed for API containers */
 
-      channelsModule = {
+      channelsModule = { name, ... }: {
         options = with types; {
           input = mkOption {
             type = flakeType;
-            default = nixos;
+            default = cfg.inputs.${name};
+            defaultText = "inputs.<name>";
             description = ''
               nixpkgs flake input to use for this channel
             '';
           };
           overlays = mkOption {
-            type = pathToListOf overlayType;
+            type = coercedListOf overlayType;
             default = [ ];
-            description = ''
+            description = escape [ "<" ">" ] ''
               overlays to apply to this channel
-              these will get exported under the 'overlays' flake output as <channel>/<name>
-            '';
-          };
-          externalOverlays = mkOption {
-            type = pathToListOf overlayType;
-            default = [ ];
-            description = ''
-              overlays to apply to the channel that don't get exported to the flake output
-              useful to include overlays from inputs
+              these will get exported under the 'overlays' flake output
+              as <channel>/<name> and any overlay pulled from ''\${inputs}
+              will be filtered out
             '';
           };
           config = mkOption {
             type = pathTo attrs;
             default = { };
+            apply = lib.recursiveUpdate cfg.channelsConfig;
             description = ''
               nixpkgs config for this channel
             '';
@@ -82,21 +80,25 @@ let
 
       hostModule = {
         options = with types; {
+          # anything null in hosts gets filtered out by mkFlake
           system = mkOption {
-            type = systemType;
-            default = "x86_64-linux";
+            type = (nullOr systemType) // {
+              description = "system defined in `supportedSystems`";
+            };
+            default = null;
             description = ''
               system for this host
             '';
           };
           channelName = mkOption {
-            type = types.enum (builtins.attrValues config.channels);
-            default = "nixpkgs";
+            type = (nullOr (types.enum (builtins.attrNames config.channels))) // {
+              description = "a channel defined in `channels`";
+            };
+            default = null;
             description = ''
               Channel this host should follow
             '';
           };
-
         };
       };
 
@@ -105,10 +107,11 @@ let
       externalModulesModule = {
         options = {
           externalModules = mkOption {
-            type = pathToListOf moduleType;
+            type = with types; listOf moduleType;
             default = [ ];
             description = ''
-              The configuration for this host
+              modules to include that won't be exported
+              meant importing modules from external flakes
             '';
           };
         };
@@ -117,7 +120,7 @@ let
       modulesModule = {
         options = {
           modules = mkOption {
-            type = pathToListOf moduleType;
+            type = with types; coercedListOf moduleType;
             default = [ ];
             description = ''
               modules to include
@@ -126,13 +129,31 @@ let
         };
       };
 
+      exportModulesModule = name: {
+        options = {
+          modules = mkOption {
+            type = with types; pathTo (coercedListOf exportModuleType);
+            default = [ ];
+            description = ''
+              modules to include in all hosts and export to ${name}Modules output
+            '';
+          };
+        };
+      };
+
+
+
       # Home-manager's configs get exported automatically from nixos.hosts
       # So there is no need for a host options in the home namespace
       # This is only needed for nixos
-      includeHostsModule = { name, ... }: {
+      includeHostsModule = name: {
         options = with types; {
           hostDefaults = mkOption {
-            type = submodule [ hostModule externalModulesModule modulesModule ];
+            type = submodule [
+              hostModule
+              externalModulesModule
+              (exportModulesModule name)
+            ];
             default = { };
             description = ''
               Defaults for all hosts.
@@ -152,16 +173,17 @@ let
       };
 
       # profiles and suites - which are profile collections
-      profilesModule = { name, ... }: {
+      profilesModule = { config, ... }: {
         options = with types; {
           profiles = mkOption {
-            type = coercedListOf path;
+            type = listOf path;
             default = [ ];
-            apply = list:
-              # Merge a list of profiles to one set
-              let profileList = map (x: os.mkProfileAttrs (toString x)) list; in
-              foldl (a: b: a // b) { } profileList;
-            description = "path to profiles folder that can be collected into suites";
+            description = ''
+              profile folders that can be collected into suites
+              the name of the argument passed to suites is based
+              on the folder name.
+              [ ./profiles ] => { profiles }:
+            '';
           };
           suites = mkOption {
             type = pathTo (functionTo attrs);
@@ -171,8 +193,7 @@ let
               inherit (config) profiles;
             };
             description = ''
-              Function with the input of 'profiles' that returns an attribute set
-              with the suites for this config system.
+              Function that takes profiles and returns suites for this config system
               These can be accessed through the 'suites' special argument.
             '';
           };
@@ -180,11 +201,22 @@ let
       };
     in
     {
+      # this does not get propagated to submodules
+      # to allow passing flake outputs directly to mkFlake
+      config._module.check = false;
+
       options = with types; {
         self = mkOption {
           type = flakeType;
           description = "The flake to create the devos outputs for";
         };
+        inputs = mkOption {
+          type = attrsOf flakeType;
+          description = ''
+            inputs for this flake
+            used to set channel defaults and create registry
+          '';
+        };
         supportedSystems = mkOption {
           type = listOf str;
           default = lib.defaultSystems;
@@ -192,31 +224,33 @@ let
             The systems supported by this flake
           '';
         };
-        channels =
-          let
-            default = {
-              nixpkgs = {
-                input = nixos;
-              };
-            };
-          in
-          mkOption {
-            type = attrsOf (submodule channelsModule);
-            inherit default;
-            apply = x: default // x;
-            description = ''
-              nixpkgs channels to create
-            '';
-          };
-        os = mkOption {
-          type = submodule [ includeHostsModule profilesModule ];
+        channelsConfig = mkOption {
+          type = pathTo attrs;
+          default = { };
+          description = ''
+            nixpkgs config for all channels
+          '';
+        };
+        channels = mkOption {
+          type = attrsOf (submodule channelsModule);
+          default = { };
+          description = ''
+            nixpkgs channels to create
+          '';
+        };
+        nixos = mkOption {
+          type = submodule [ (includeHostsModule "nixos") profilesModule ];
           default = { };
           description = ''
             hosts, modules, suites, and profiles for nixos
           '';
         };
         home = mkOption {
-          type = submodule [ profilesModule modulesModule ];
+          type = submodule [
+            profilesModule
+            (exportModulesModule "home")
+            externalModulesModule
+          ];
           default = { };
           description = ''
             hosts, modules, suites, and profiles for home-manager
diff --git a/lib/mkFlake/evalOldArgs.nix b/lib/mkFlake/evalOldArgs.nix
deleted file mode 100644
index c319d43a..00000000
--- a/lib/mkFlake/evalOldArgs.nix
+++ /dev/null
@@ -1,162 +0,0 @@
-{ lib }:
-
-{ self, inputs, args }:
-let
-  argOpts = with lib; { config, options, ... }:
-    let
-      inherit (lib) os;
-
-      inherit (config) self;
-
-      inputAttrs = with types; functionTo attrs;
-      moduleType = with types; anything // {
-        inherit (submodule { }) check;
-        description = "valid module";
-      };
-    in
-    {
-      options = with types; {
-        self = mkOption {
-          type = addCheck attrs lib.isStorePath;
-          description = "The flake to create the devos outputs for";
-        };
-        nixos = mkOption {
-          type = addCheck attrs lib.isStorePath;
-          description = "The default nixpkgs channel of the devos";
-        };
-        inputs = mkOption {
-          type = addCheck attrs lib.isStorePath;
-          description = "All inptus of the devos";
-        };
-        hosts = mkOption {
-          type = path;
-          default = "${self}/hosts";
-          defaultText = "\${self}/hosts";
-          apply = toString;
-          description = ''
-            Path to directory containing host configurations that will be exported
-            to the 'nixosConfigurations' output.
-          '';
-        };
-        packages = mkOption {
-          # functionTo changes arg names which breaks flake check
-          type = types.anything // {
-            check = builtins.isFunction;
-            description = "Nixpkgs overlay";
-          };
-          default = (final: prev: { });
-          defaultText = "(final: prev: {})";
-          description = ''
-            Overlay for custom packages that will be included in treewide 'pkgs'.
-            This should follow the standard nixpkgs overlay format - two argument function
-            that returns an attrset.
-            These packages will be exported to the 'packages' and 'legacyPackages' outputs.
-          '';
-        };
-        modules = mkOption {
-          type = listOf moduleType;
-          default = [ ];
-          apply = lib.pathsToImportedAttrs;
-          description = ''
-            list of modules to include in confgurations and export in 'nixosModules' output
-          '';
-        };
-        userModules = mkOption {
-          type = listOf moduleType;
-          default = [ ];
-          apply = lib.pathsToImportedAttrs;
-          description = ''
-            list of modules to include in home-manager configurations and export in
-            'homeModules' output
-          '';
-        };
-        profiles = mkOption {
-          type = path;
-          default = "${self}/profiles";
-          defaultText = "\${self}/profiles";
-          apply = x: os.mkProfileAttrs (toString x);
-          description = "path to profiles folder that can be collected into suites";
-        };
-        userProfiles = mkOption {
-          type = path;
-          default = "${self}/users/profiles";
-          defaultText = "\${self}/users/profiles";
-          apply = x: os.mkProfileAttrs (toString x);
-          description = "path to user profiles folder that can be collected into userSuites";
-        };
-        suites =
-          let
-            defaults = { user = { }; system = { }; };
-          in
-          mkOption {
-            type = inputAttrs;
-            default = { ... }: defaults;
-            defaultText = "{ user = {}; system = {}; }";
-            apply = suites: defaults // os.mkSuites {
-              inherit suites;
-              inherit (config) profiles users userProfiles;
-            };
-            description = ''
-              Function with inputs 'users' and 'profiles' that returns attribute set
-              with user and system suites. The former for Home Manager and the latter
-              for nixos configurations.
-              These can be accessed through the 'suites' specialArg in each config system.
-            '';
-          };
-        users = mkOption {
-          type = path;
-          default = "${self}/users";
-          defaultText = "\${self}/users";
-          apply = x: os.mkProfileAttrs (toString x);
-          description = ''
-            path to folder containing profiles that define system users
-          '';
-        };
-        extern =
-          let
-            defaults = {
-              modules = [ ];
-              overlays = [ ];
-              specialArgs = { };
-              userModules = [ ];
-              userSpecialArgs = { };
-            };
-          in
-          mkOption {
-            type = inputAttrs;
-            default = { ... }: defaults;
-            defaultText = ''
-              { modules = []; overlays = []; specialArgs = []; userModules = []; userSpecialArgs = []; }
-            '';
-            # So unneeded extern attributes can safely be deleted
-            apply = x: defaults // (x { inputs = inputs // self.inputs; });
-            description = ''
-              Function with argument 'inputs' that contains all devos and ''${self}'s inputs.
-              The function should return an attribute set with modules, overlays, and
-              specialArgs to be included across nixos and home manager configurations.
-              Only attributes that are used should be returned.
-            '';
-          };
-        overlays = mkOption {
-          type = path;
-          default = "${self}/overlays";
-          defaultText = "\${self}/overlays";
-          apply = x: lib.pathsToImportedAttrs (lib.pathsIn (toString x));
-          description = ''
-            path to folder containing overlays which will be applied to pkgs and exported in
-            the 'overlays' output
-          '';
-        };
-        overrides = mkOption rec {
-          type = attrs;
-          default = { modules = [ ]; disabledModules = [ ]; packages = _: _: _: { }; };
-          defaultText = "{ modules = []; disabledModules = []; packages = {}; }";
-          apply = x: default // x;
-          description = "attrset of packages and modules that will be pulled from nixpkgs master";
-        };
-      };
-    };
-in
-lib.evalModules {
-  modules = [ argOpts args ];
-}
diff --git a/lib/modules.nix b/lib/modules.nix
index 7024f13f..6e2a3525 100644
--- a/lib/modules.nix
+++ b/lib/modules.nix
@@ -1,28 +1,16 @@
 { lib }:
 {
-  modOverrides = { overrides }:
-    { config, overrideModulesPath, ... }:
-    let
-      inherit (overrides) modules disabledModules;
-    in
-    {
-      disabledModules = modules ++ disabledModules;
-      imports = map
-        (path: "${overrideModulesPath}/${path}")
-        modules;
-    };
-
-  hmDefaults = { userSuites, extern, homeModules }: {
+  hmDefaults = { suites, modules }: {
     home-manager = {
       useGlobalPkgs = true;
       useUserPackages = true;
 
-      extraSpecialArgs = extern.userSpecialArgs // { suites = userSuites; };
-      sharedModules = extern.userModules ++ (builtins.attrValues homeModules);
+      extraSpecialArgs = { inherit suites; };
+      sharedModules = modules;
     };
   };
 
-  globalDefaults = { self, nixos, inputs, multiPkgs }:
+  globalDefaults = { self, inputs }:
     let
       experimentalFeatures = [
         "flakes"
@@ -31,49 +19,41 @@
         "ca-derivations"
       ];
     in
-    { config, pkgs, ... }: {
+    { channel, config, pkgs, ... }: {
       users.mutableUsers = lib.mkDefault false;
 
       hardware.enableRedistributableFirmware = lib.mkDefault true;
 
       nix.nixPath = [
-        "nixpkgs=${nixos}"
+        "nixpkgs=${channel.input}"
         "nixos-config=${self}/lib/compat/nixos"
         "home-manager=${inputs.home}"
       ];
 
-      nixpkgs.pkgs = lib.mkDefault multiPkgs.${config.nixpkgs.system};
-
       nix.registry = {
         devos.flake = self;
-        nixos.flake = nixos;
-        override.flake = inputs.override;
+        nixos.flake = channel.input;
       };
 
-      nix.package = pkgs.nixFlakes;
-
       nix.extraOptions = ''
         experimental-features = ${lib.concatStringsSep " "
           experimentalFeatures
         }
       '';
 
+      _module.args = {
+        inherit self;
+        hosts = builtins.mapAttrs (_: host: host.config)
+          (removeAttrs self.nixosConfigurations [ config.networking.hostName ]);
+      };
+
       system.configurationRevision = lib.mkIf (self ? rev) self.rev;
     };
 
-  cachix = { self }:
-    let rootCachix = "${self}/cachix.nix"; in
-    if builtins.pathExists rootCachix
-    then rootCachix
-    else { };
+  isoConfig = { self, inputs, fullHostConfig }:
+    { config, modulesPath, suites, ... }: {
 
-  flakeModules = { self, extern }: { imports = builtins.attrValues self.nixosModules ++ extern.modules; };
-
-  isoConfig = { self, nixos, inputs, fullHostConfig }:
-    { config, suites, ... }: {
-
-      imports = let modpath = "nixos/modules"; in
-        [ "${nixos}/${modpath}/installer/cd-dvd/installation-cd-minimal-new-kernel.nix" ];
+      imports = [ "${modulesPath}/installer/cd-dvd/installation-cd-minimal-new-kernel.nix" ];
       # avoid unwanted systemd service startups
       # all strings in disabledModules get appended to modulesPath
       # so convert each to list which can be coerced to string
diff --git a/lib/pkgs-lib/default.nix b/lib/pkgs-lib/default.nix
index 1cadc2fe..bcaee771 100644
--- a/lib/pkgs-lib/default.nix
+++ b/lib/pkgs-lib/default.nix
@@ -1,13 +1,6 @@
-{ lib, nixpkgs, deploy, devshell }:
+{ lib, deploy, devshell }:
+{
+  tests = import ./tests { inherit lib deploy; };
+  shell = import ./shell { inherit lib devshell deploy; };
+}
 
-lib.genAttrs
-  lib.defaultSystems
-  (system:
-    let
-      pkgs = import nixpkgs { inherit system; };
-    in
-    {
-      tests = import ./tests { inherit lib deploy nixpkgs pkgs system; };
-      shell = import ./shell { inherit lib devshell deploy nixpkgs system; };
-    }
-  )
diff --git a/lib/pkgs-lib/shell/default.nix b/lib/pkgs-lib/shell/default.nix
index 0146ca22..5b73b54c 100644
--- a/lib/pkgs-lib/shell/default.nix
+++ b/lib/pkgs-lib/shell/default.nix
@@ -1,27 +1,30 @@
-{ lib, nixpkgs, devshell, deploy, system }:
+{ lib, devshell, deploy }:
+
+{ pkgs }:
 let
   overlays = [
-
     devshell.overlay
 
     (final: prev: {
       deploy-rs =
         deploy.packages.${prev.system}.deploy-rs;
     })
-
   ];
 
-  pkgs = import nixpkgs { inherit system overlays; config = { }; };
+  pkgs' = import pkgs.path {
+    inherit (pkgs) system;
+    inherit overlays;
+  };
 
-  flk = pkgs.callPackage ./flk.nix { };
+  flk = pkgs'.callPackage ./flk.nix { };
 
   installPkgs = (lib.nixosSystem {
-    inherit system;
+    inherit (pkgs') system;
     modules = [ ];
   }).config.system.build;
 in
-pkgs.devshell.mkShell {
-  imports = [ (pkgs.devshell.importTOML ./devshell.toml) ];
+pkgs'.devshell.mkShell {
+  imports = [ (pkgs'.devshell.importTOML ./devshell.toml) ];
 
   packages = with installPkgs; [
     nixos-install
@@ -33,13 +36,13 @@ pkgs.devshell.mkShell {
     pre-commit.text = lib.fileContents ./pre-commit.sh;
   };
 
-  commands = with pkgs; [
+  commands = with pkgs'; [
     { package = flk; }
     {
       name = "nix";
-      help = pkgs.nixFlakes.meta.description;
+      help = pkgs'.nixFlakes.meta.description;
       command = ''
-        ${pkgs.nixFlakes}/bin/nix --experimental-features "nix-command flakes ca-references" "${"\${@}"}"
+        ${pkgs'.nixFlakes}/bin/nix --experimental-features "nix-command flakes ca-references" "${"\${@}"}"
       '';
     }
   ]
diff --git a/lib/pkgs-lib/tests/default.nix b/lib/pkgs-lib/tests/default.nix
index b3e60624..854332fe 100644
--- a/lib/pkgs-lib/tests/default.nix
+++ b/lib/pkgs-lib/tests/default.nix
@@ -1,25 +1,28 @@
-{ lib, nixpkgs, pkgs, deploy, system }:
+{ lib, deploy }:
 let
-  mkChecks = { hosts, nodes, homes ? { } }:
+  mkChecks = { pkgs, hosts, nodes, homes ? { } }:
     let
       deployHosts = lib.filterAttrs
-        (n: _: hosts.${n}.config.nixpkgs.system == system)
+        (n: _: hosts.${n}.config.nixpkgs.system == pkgs.system)
         nodes;
-      deployChecks = deploy.lib.${system}.deployChecks { nodes = deployHosts; };
+      deployChecks = deploy.lib.${pkgs.system}.deployChecks { nodes = deployHosts; };
       tests =
         lib.optionalAttrs (deployHosts != { })
           {
-            profilesTest = profilesTest (hosts.${(builtins.head (builtins.attrNames deployHosts))});
+            profilesTest = profilesTest {
+              inherit pkgs;
+              host = hosts.${(builtins.head (builtins.attrNames deployHosts))};
+            };
           } // lib.mapAttrs (n: v: v.activationPackage) homes;
 
     in
     lib.recursiveUpdate tests deployChecks;
 
-  mkTest = host:
+  mkTest = { pkgs, host }:
     let
       nixosTesting =
-        (import "${nixpkgs}/nixos/lib/testing-python.nix" {
-          inherit system;
+        (import "${toString pkgs.path}/nixos/lib/testing-python.nix" {
+          inherit (pkgs) system;
           inherit (host.config.lib) specialArgs;
           inherit pkgs;
           extraConfigurations = [
@@ -40,15 +43,15 @@ let
     in
     nixosTesting.makeTest calledTest;
 
-  profilesTest = host: mkTest host {
+  profilesTest = args@{ host, ... }: mkTest args {
     name = "profiles";
 
     machine = { suites, ... }: {
-      imports = suites.allProfiles ++ suites.allUsers;
+      imports = suites.allProfiles;
     };
 
     testScript = ''
-      machine.systemctl("is-system-running --wait")
+      ${host.config.networking.hostName}.systemctl("is-system-running --wait")
     '';
   };
 in
diff --git a/lib/tests/lib.nix b/lib/tests/lib.nix
index 66264787..e992df67 100644
--- a/lib/tests/lib.nix
+++ b/lib/tests/lib.nix
@@ -71,23 +71,19 @@ lib.runTests {
     };
   };
 
-  testSuites =
-    let
-      profiles = os.mkProfileAttrs (toString ./profiles);
-      users = "";
-      userProfiles = "";
-      suites = { profiles, ... }: {
-        system.bar = [ profiles.foo ];
-      };
-    in
-    {
-      expr = os.mkSuites { inherit profiles users userProfiles suites; };
-      expected = {
-        system = {
-          bar = [ profiles.foo.default ];
-          allProfiles = [ profiles.foo.default profiles.t.default ];
-          allUsers = [ ];
-        };
+  testSuites = {
+    expr = os.mkSuites {
+      suites = { profiles, ... }: with profiles; {
+        bar = [ foo ];
       };
+      profiles = [ (./profiles) ];
     };
+    expected = {
+      bar = [ (toString ./profiles/foo) ];
+      allProfiles = [
+        (toString ./profiles/foo)
+        (toString ./profiles/t)
+      ];
+    };
+  };
 }
diff --git a/overlays/overrides.nix b/overlays/overrides.nix
new file mode 100644
index 00000000..bb3cf68b
--- /dev/null
+++ b/overlays/overrides.nix
@@ -0,0 +1,26 @@
+channels: final: prev: {
+
+  inherit (channels.latest)
+    cachix
+    dhall
+    discord
+    element-desktop
+    manix
+    nixpkgs-fmt
+    qutebrowser
+    signal-desktop
+    starship;
+
+
+  haskellPackages = prev.haskellPackages.override {
+    overrides = hfinal: hprev:
+      let version = prev.lib.replaceChars [ "." ] [ "" ] prev.ghc.version;
+      in
+      {
+        # same for haskell packages, matching ghc versions
+        inherit (channels.latest.haskell.packages."ghc${version}")
+          haskell-language-server;
+      };
+  };
+
+}