Nixos Netboot, how to use build configuration inside configuration.nix

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Hello,
i am trying to setup a netboot for a nixos config. I have tried for quite some hours but i came across this post that is similar to the wiki entry but it actually worked for the netboot.xyz so now i only need to know how i can build the configuration and then use it to install it on boot.

I am having trouble to find out how i setup the config so it works like it does in netboot.xyz

in my configuration.nix this works fine:

{ config, lib, pkgs, ... }:

{
  services.pixiecore = {
    enable = true;
    openFirewall = true;
    dhcpNoBind = true;
    kernel = "https://boot.netboot.xyz";
  };
}

this on the other hand does not really work since i get an error for the “let”

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

let
  sys = inputs.nixos.lib.nixosSystem {
    system = "x86_64-linux";
    modules = [
      ({ config, pkgs, lib, modulesPath, ... }: {
        imports = [ (modulesPath + "/installer/netboot/netboot-minimal.nix") ];
        config = {
          services.openssh = {
            enable = true;
            openFirewall = true;

            settings = {
              PasswordAuthentication = false;
              KbdInteractiveAuthentication = false;
            };
          };

          users.users.root.openssh.authorizedKeys.keys = [
            "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAI..."
          ];
        };
      })
    ];
  };

  build = sys.config.system.build;
in {
  services.pixiecore = {
    enable = true;
    openFirewall = true;
    dhcpNoBind = true; # Use existing DHCP server.

    mode = "boot";
    kernel = "${build.kernel}/bzImage";
    initrd = "${build.netbootRamdisk}/initrd";
    cmdLine = "init=${build.toplevel}/init loglevel=4";
    debug = true;
  };
}

any recommendations on how to build the system and then use it inside the service? the problem is the path i think

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