Want to, but my map's a bit too ambitious to finish in a week, WITH constant playing of DOOM (finally bought Collector's Edition, it rocks) and... egh, homework... *shudder*
I might crap something out just to have some competition, though, and release whatever I've got at a later date as a standalone (or for another contest, I dunno). Another conversion of a DOOM map would be cool, but DOOM's nonlinear style doesn't work too well with SRB2's somewhat more linear style, so... I dunno, I might convert DOOM II's MAP01 or MAP07 for multiplayer or something. Those seem to be popular.