here we go

overlays/default.nix

@@ -0,0 +1,18 @@
+{inputs, ...}: {
+  # This one brings our custom packages from the 'pkgs' directory
+  additions = final: _prev: import ../pkgs {pkgs = final;};
+
+  # This one contains whatever you want to overlay
+  # You can change versions, add patches, set compilation flags, anything really.
+  # https://nixos.wiki/wiki/Overlays
+  modifications = final: prev: {
+    n8n = import ./mods/n8n.nix {inherit prev;};
+  };
+
+  stable-packages = final: _prev: {
+    stable = import inputs.nixpkgs-stable {
+      system = final.system;
+      config.allowUnfree = true;
+    };
+  };
+}

overlays/mods/n8n.nix

@@ -0,0 +1,17 @@
+{prev}:
+prev.n8n.overrideAttrs (oldAttrs: rec {
+  pname = oldAttrs.pname;
+  version = "1.63.0";
+
+  src = prev.fetchFromGitHub {
+    owner = "n8n-io";
+    repo = "n8n";
+    rev = "n8n@${version}";
+    hash = "sha256-zJHveCbBPJs8qbgCsU+dgucoXpAKa7PVLH4tfdcJZlE=";
+  };
+
+  pnpmDeps = prev.pnpm.fetchDeps {
+    inherit pname version src;
+    hash = "sha256-FsBA/QENfreCJnYCw8MnX5W2D+WJ3DUuTIakH78TYU8=";
+  };
+})