30 levels for Doom II v1.9 - 20 levels support all play modes, and there's 10 Deathmatch-only levels as well.
ChrisWAD also includes new sounds, music, graphics, a new monster (The Blob), and several changes to the existing monsters.
Credits:
The authors of all the utilities and editors who make this hobby possible. Did I just call Doom a hobby? ... I meant lifestyle ;)
Base:
New levels from scratch of course
Build time:
Who knows? About 900 hrs + endless testing Didnt work on it all summer
Editor(s) used:
DEU 5.1, DoomCad 4.3, DeeP 6.11, WAD_DWD / IDBSP 1.0 , DMAUD 1.1, DMGRAPH 1.1, DMMUSIC 1.0a, DOOM2WAD 1.00, Sound Recorder ( Windows ), NeoPaint 3.0, LView 3.1, DeHackEd 2.3, Midi2Mus, and DEUSF 3.6 DEEP is the most kick ass level editor!
Bugs:
Got some visplane errors in Map21 and Map23. Fixed them now but mail me if you get the error again.