I'm an oldskool map developer, so I really can't help you there (since now it would utilize the new features)
I can, however, write some tunes, whether it be in streamed or module format

Maybe even some re-arrangements from the original Doom's levels. (And no, they won't be direct conversions, those really suck. I'm talking, re-writes)
Oh yeah, and a reference to my work:
http://www.soundclick.com/saxxonpike (but I bet you already knew..)