I was planning on making it kind of like an overworld map like Super Mario World or Donkey Kong Country. The picture though I was planning on using a modified final version one. Just add the four missing buildings and the monorail tracks.
@BoldEnglishman
No, it isn't. Keep in mind this is unfinished, and I am planning on adding that. How though, I'm not sure. Should it be sprite based or flat based? (I don't want it to screw up the entire sector though)
"In other news, this looks pretty good!"
And thanks!

EDIT: Mockup pic of the intermission screen:

Edit 2: @ lukas
Possibly, but it's nowhere near complete enough for a demo. (unless you just want the first level, e1m2 is mostly complete on the ground floor, but the second floor is only modified at the end of it though)