I experimented with trenchbroom too! But mostly I used the cyclops level builder, will prob switch to trenchbroom tho cuz it crashes significantly less
I tried Cyclops in the past, but ended up ditching it for blender lol, it crashed way too much. In trenchbroom you can just texture the brushed automatically, so that's what I used. I wanted to add decals and stuff around the maps, but I ran out of time, so I didn't even look into it