(The following text is from MULTI.TXT.) I have included three files in MULTI.ZIP: This text file, MULTI1.WAD and MULTI2.WAD. MULTI1.WAD is the original board I created, and MULTI2.WAD is the outcome after using BSP on my game. Try standing on the elevator near the sides of it and see what happens...you should be left at ground level while the elevator rises (without you). You might have to fight off imps first though because I put a lot in there.
If you don't like something about the board (too many monsters/powerups), feel free to change it around. I didn't spend much time on placing monsters or items, since I spent tons of time trying to get the board to work. Also, I didn't bother to match up the wall textures very well.
I haven't tried it in multi-player mode yet, so I don't know if it will be good or not.