The map is very straightforward (too straightforward maybe?), so you shouldn't have any problems finding your way. If only I had that kind of patience/time now :) I didn't know you could select multiple linedefs in DoomCAD back then, so I was actually insane enough to manually select each and every linedef, apply the texture and align it. Most of it was made (on and off) during 2001-03 using DoomCAD (the exit area was built using Doom Builder though). It was originally made for a project called The Ninth Gate that never saw the light of day. This map is heavily inspired by Episode 4 of The Ultimate Doom, especially E4M1 and E4M6.