I don't want to use 3d midtextures for this particular bridge construct, as I want to simulate a fake floor-over-floor effect. Aesthetically, it looks fine with a fake Transfer_Heights floor acting as the upper floor and the lower ceiling, and the way I've set the map up, both floors can't be seen at the same time. The problem comes when I want the floor to be solid, and I've used bridge actors to achieve this effect - but they appear as "GROSS HACK"s.
