maybe I'm overthinking things?

nix-conf/system/flake.lock

@@ -1,33 +1,12 @@
 {
   "nodes": {
-    "home-manager": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ],
-        "utils": "utils"
-      },
-      "locked": {
-        "lastModified": 1669071065,
-        "narHash": "sha256-KBpgj3JkvlPsJ3duOZqFJe6tgr+wc75t8sFmgRbBSbw=",
-        "owner": "nix-community",
-        "repo": "home-manager",
-        "rev": "f7641a3ff398ccce952e19a199d775934e518c1d",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "home-manager",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1669140675,
-        "narHash": "sha256-npzfyfLECsJWgzK/M4gWhykP2DNAJTYjgY2BWkz/oEQ=",
+        "lastModified": 1671200928,
+        "narHash": "sha256-mZfzDyzojwj6I0wyooIjGIn81WtGVnx6+avU5Wv+VKU=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "2788904d26dda6cfa1921c5abb7a2466ffe3cb8c",
+        "rev": "757b82211463dd5ba1475b6851d3731dfe14d377",
         "type": "github"
       },
       "original": {
@@ -38,24 +17,8 @@
     },
     "root": {
       "inputs": {
-        "home-manager": "home-manager",
         "nixpkgs": "nixpkgs"
       }
-    },
-    "utils": {
-      "locked": {
-        "lastModified": 1667395993,
-        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
     }
   },
   "root": "root",

nix/calculus/std.example.nix

@@ -1,3 +1,4 @@
+# An example on how this would be imported (along with test cases)
 let
   pkgs = import <nixpkgs> { };
   inherit (pkgs) lib;

nix/flake.nix

@@ -32,7 +32,7 @@
       # fundamental functions that should only take 2 keystrokes instead of builtins (8)
       c_ = import ./calculus;
       overlays = [ rust-overlay.overlays.default nixgl.overlay ];
-    in c_
+    in 
     { };
 
 }

nix/hosts/default.nix

@@ -0,0 +1,20 @@
+# Each host will export optionally its nixosConfiguration, which also manages its 
+# own hardware-configuration
+{ pkgs # nixpkgs imported
+, lib  # extended lib
+, c_
+, nixos_lib # nixpkgs/nixos/lib
+, flake-utils-plus
+, ...
+}@inputs:
+let
+  # ({sys: str} -> nixosConfiguration) -> nixosConfigurations-compatible-host for defaultSystems
+  mkHost = nixosConfigFn: c_.list2Attrs_ flake-utils-plus.lib.defaultSystems (sys: {
+    ${sys} = nixos_lib.nixosSystem ({ system = sys; } // (nixosConfigFn { inherit sys; }));
+  });
+in
+{
+  Felia = mkHost { };
+  lizzi = mkHost { };
+}
+

nix/pkgs/default.nix

@@ -0,0 +1 @@
+# Contains the wrapper modules for programs and services available to 

nix/types/default.nix

@@ -2,6 +2,4 @@
 , lib ? inputs.pkgs.lib
 , ...
 }@inputs:
-{
-
-}
+lib.recursiveUpdate lib.types { }