Woah! That is awesome, Tig! It's incredible how good-looking you can make a map even just with the default textures, though I clearly see some custom ones (and models like those trees). Your mapping skills have certainly come a long way since the early 2000's. The architecture reminds me of some Doom 2 mods I've played in ZDaemon (I think one of them was Scythe) a long time ago.
Seeing this might inspire me to return to working on my mapping projects I've been procrastinating on...