Add neopywal plugin to nixvim

[GoGoGadgetGitHub]

Hello everyone I'm having allot of trouble figuring this out and I'm hoping someone can help me.

I did read the docs about adding plugins not packaged in nix packages but I'm still pretty confused on this topic. From what i've gathered there are two ways of doing this. One is to use build it using packages.FetchFromGit and the second is adding the plugin as an input in my flake and then adding it to vimPlugins using overlays. (I'll admit i'm really new to nix and i don't know what i'm doing so bare with me please). I opted for the latter since this would mean i don't have to update the hash of the plugin myself.

I followed some instructions i found on yt and came up with the following. Please feel free to correct me in any way.

Here is what i'm doing in my flake:

{
    description = "Nixos config flake";

    inputs = {
        nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";

        home-manager = {
            url = "github:nix-community/home-manager";
            inputs.nixpkgs.follows = "nixpkgs";
        };

        nixvim = {
            url = "github:nix-community/nixvim";
            inputs.nixpkgs.follows = "nixpkgs";
        };

        plugin-neopywal.url = "https://github.com/RedsXDD/neopywal.nvim.git"; 
        plugin-neopywal.flake = false;
    };

    outputs = { self, nixpkgs, nixvim, ... }@inputs: {
        nixosConfigurations.default = nixpkgs.lib.nixosSystem {
            specialArgs = {inherit inputs;};
            modules = [
                ./configuration.nix

                    inputs.home-manager.nixosModules.home-manager {
                        home-manager.useGlobalPkgs = true;
                        home-manager.useUserPackages = true;
                        home-manager.sharedModules = [
                            nixvim.homeManagerModules.nixvim
                        ];
                    }
            ];
        };
    };
}

Then i'm enabling nixvim through home manager in a file called nixvim.nix (this is ofc imported into my home.nix):

{config, pkgs, inputs, ...}:

{
  imports = [
    ./options.nix
    ./keymaps.nix
    ./plugins/neo-tree.nix
    ./plugins/barbar.nix
    ./plugins/neopywal-vim.nix
  ];

  programs.nixvim = {
    enable = true;
    plugins.lualine.enable = true;
  };
}

Then in neopywal-vim.nix, i'm attempting to add the plugin to vimPlugins:

{config, pkgs, inputs, ...}:

{
    #code to add plugin to vimPlugins with inputs defined in flake.
    #might move this to it's own file later so i can just come here and add plugings i find
    nixpkgs = {
        overlays = [
          (final: prev: {
            vimPlugins = prev.vimPlugins // {
              neopywal = prev.vimUtils.buildVimPlugin {
                name = "neopywal";
                src = inputs.plugin-neopywal;
              };
            };
          })
        ];
      };

    #adding plugin to nixvim and doing the config
    programs.nixvim = {
        extraPlugins = [pkgs.vimPlugins.neopywal];
        extraConfigLua = ''
            local neopywal = require('pywal16')
            neopywal.setup()
            vim.cmd.colorcheme("neopywal")
        '';
    };
}

Trying to build i just get error: attribute 'neopywal' missing. Which indicates to me that I'm adding to plugin to vimPlugins incorrectly.