AB3D did a lot of things DOOM engine couldn't handle, how much of that is covered by using BOOM? The only thing I see mentioned here is not being able to look through water.
What about real 3D levels (with floors directly on top of each other)? If the AB3D level size is a problem for Quake (see the other AB3D project), isn't it very likely also a problem for Doom/BOOM?
