Abomination of desolation!
Trying to figure out how to make Doom 64 style layer-over-layer architecture...
Overlapped sectors, walls out front, no floor and ceiling, 64 pixels high over a normal (and higher) sector.
It does not look good.
Walls in front with floor and ceiling does not show up at all and glitches the geometry much worse than this trick.
I can't get the effect, these are the ideas I had.
Remember, the point is not to use things modern source ports offer.