my mapping knowledge is little to none, to say the least, but it wasn't hard to appreciate the game Prey and its multiplayer. The idea of being able to walk on floors that become walls and ceilings as you navigate through the map, having really no defenition of up or down as you shoot fellow players is a simply cool idea. Is this something do-able or see-able in nexuiz? I know nex uses radiant, and so does doom3, and prey runs off the doom3 engine. I dont know exactly what they do to pull off the effect but im sure it would be lovely to see the nexuiz spin on it.
Heres some vids of Prey if anyone hasn't seen it.
http://media.pc.ign.com/media/008/008926/vids_1.html (bottom right gets to the point)
Try not to be put off by the first post, im an avid player and had a forum account several months and 2 deactivated emails down the road.

yeah man, that rug really tied the room together..
If Your looking for Music for any map/ project, id love to supply!
mussymusic@gmail.com myspace.com/mussymusic