I've got it all but finished again.
Compiling as I type.
There were only a few glitches that I could find & fix, so I'm certainly almost done.
Just tweaking the tree, actually.
I will, of course, post pix when it's ready.
Cheers !
p.s. R_speeds went down considerably on the compile where I'd NULLed the back faces of everything touching another surface.
Some where func_walls & others were just world brushes though, so I don't know which one did the magic ! LOL !