Currently spotted something bretty interesting over at Doomworld when browsing the community forums. Death Egg
started a new project called Switcheroom
which sounds like an ambitious and funny thing to work on: "Basically, I got the idea to remake E1M1, but if it had appeared in Episode 3 instead of Episode 1. I got the idea after a friend of mine who only plays Doom a little accidentally mixed up some maps with the wrong episodes, and I began to wonder what it'd be like if they actually had appeared in that episode instead."
You can actually find some screenshots, rules and other basic stuff in the development thread
over at Doomworld. I really encourage you people to support him, this doesn't only sound like a lot of fun when working on but also when playing it!