David is absolutely right, at the very least we can be discussing the possibility of such a thing happening within the limits of the quake 3 engine. I'm kinda surprised that this guy had such a negative reaction. Hell, ReapDaWrapper even said he would get flamed in the beginning. Doesn't that say something?
Anyways, we could have a menu, using a spawn-able entity like a solid line of wall that can be rotated (Possible re-sized?) on the map as a layout. Making human/alien NPCs using the basic AI found in QVMs/Mods like Spectator's, etc.