Add new file

pantheon.nix

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+{ config, pkgs, ... }: 
+
+{
+  # Desktop
+  services.xserver = {
+    enable = true;
+    displayManager.lightdm.greeters.pantheon.enable = false;
+    displayManager.lightdm.enable = false;
+    desktopManager.pantheon.enable = true;
+  };
+
+  # Wingpangel and Switchboard plugins
+  wingpanel-with-indicators.override {
+    indicators = [
+      pkgs.some-special-indicator
+    ];
+  };
+
+  switchboard-with-plugs.override {
+    plugs = [
+      pkgs.some-special-plug
+    ];
+  };
+  
+  # Remove Pantheon packages
+  environment.pantheon.excludePackagess = (with pkgs; [
+  pantheon.appcenter # AppCenter as it can't be used on NixOS
+  ]);
+
+  # Hacks
+  systemd.extraConfig = ''
+  DefaultTimeoutStopSec=10s
+  DefaultTimeoutStartSec=10s
+  '';
+}