Damn good job.
I've always been a fan of the Doom games, from the original to Doom 3 (although I still enjoy the classic quite a bit). That was an amazing collab, and the remixed music was pretty cool. I gotta admit though, I think SickDeatFiend and Serge's parts were the best, although Gerkinman's was pretty good too. Hope to see more collabs comin out from these authors!