DOOM 3 partial conversion

I'm currently working in a mod entitled "Waiting for DOOM 3", it consist in a partial converion that hopefully will look (considering the limitations of the DOOM engine,as similar as posible with the DOOM 3 video.
It will have a bunch of monsters with graphics extracted from the movie, and other new, all with a totaly new behavior. Some new textures, and levels.
I finished the monsters, and the textures I think is no problem, what I need is a level editor, because I can make levels, but they don't look vert good.
I'm not sure if someone wants help, I know that all the guys here are busy, but I want to try.

Hopefully soon there will be a website for the progect.