BSP will work until it doesn't. :) Eventually you'll lay a decal across a BSP cut which will cause half the decal to turn black or not light correctly and then you'll be back to meshes. That's always been my experience anyway. Heh...
I briefly had that issue! Had to mess around with the lighting a bit and change settings on the BSP surfaces. I'm not planning on going too crazy with the BSP/Decals, though-- Floors and walls like this (that don't have much height/breakouts/major physical variation) will use BSP and architectural elements shall be mostly…
Thanks, everyone who's commented and put in some assistance on this. I have check out all of the resources, many of which I had seen, some I certainly had not, and I think I've found BSP is in fact, the best way to go here. Here are a couple more shots, with the BSP version. I went back and worked up that plaster texture a…