Put these two files in the /data/menus/prefabs folder (make sure Archive Invalidation is working properly)

FILE ONE: includes_HUDMainMenu.xml contents:
<!-- ADDED by Unified HUD Project -->

<!-- BEGIN Added by Unified HUD Project 3.7 -->
<include src="pnx/pnxhud.xml" />
<!-- END Added by Unified HUD Project 3.7 -->

FILE TWO: includes_StartMenu.xml contents:
<!-- ADDED by Unified HUD Project -->

<!-- BEGIN Added by Unified HUD Project 3.7 -->
<include src="pnx/pnxpause.xml" />
<!-- END Added by Unified HUD Project 3.7 -->


<!-- BEGIN Added by Unified HUD Project 3.7 -->
<include src="MCM/MCM.xml" />
<!-- END Added by Unified HUD Project 3.7 -->

Mine has the empty lines included after the last lines. Also, fuck XML.