Also, 75, didn't you not want 3D floors? Or I guess you can use the pseudo-3D floor trick.Or wait, don't they have 3D floors in software now? Actually wait. I think that was just ZDoom and Zandronum is behind so no.
So, may I make a zorchmatch map too?
It's better to use pseudo-3D-floors where you can in replace of actual 3D-floors though, since they're a lot less resource intensive. Look up Upper and Lower Portals on the zDoom wiki. The only limitation is you can't shoot through them, so you can only use them in areas where people wouldn't be able to fire between floors. Or heck, if its just multiple story and no visible areas between the floors, just use teleporters to different floors instead of putting them directly on top of each other.