@Tormentor: I went ahead and did that, but I was a lot more subtle with it - a lot of Doom consists of dark areas, anyway, so going to the extremes as shown in that picture makes the game unplayable. Because it was a quick change, I can post that immediately. Changing the textures, however, will require a bit more work. I plan to do that, though, just not in this iteration.
Regarding the textures - I've decided I am only going to do some textures. If anyone else wants to use this in their own mod they can add their own textures as needed. I've actually found that having some red on the textures actually creates a very nice and atmospheric accent - so globally removing red from all walls/flats would probably not be that great.
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