All that's left is figuring out how to script so that you can respawn mid-game like in regular netplay. I'm looking into this myself.
Project Conflict is inspired by a Marathon 1 scenario called Marauder Second Encounter and provides a deathmatch environment with hostile Marines wielding standard weapons.
Download additional map packs for this project at
http://pfhorums.com/viewtopic.php?f=13&t=53484