Okay I just thought of this random idea.... could a mapper make a like hall. And then a modeller make the walls of the hall and just put them in the map?
yes you can, you can import models into the map and set them solid
Yes, but even though theres other options to select, md3 is the only the one that only really works, along with md2(?).
ps-ArticMonkey, id expect some cool hallways from you ;)