You should name the file something different because there already is a caves.bsp map from way back in the beginning of dp.
Sounds like he plans to call it mt_caves.bsp. I'm not a huge fan of prefixes, so perhaps it could just be called "Magic Caves", magiccaves.bsp? Also, I put betas up on a linux server, so I'd appreciate it if you kept names all lowercase, even for the beta releases.
I've attached my usual demo review, as an added bonus, some people connected while I was walking through it so you could get some gameplay footage. I was at work, though, so I couldn't play. See PM for details on loading your map. It certainly needs some more paths. and a base that's easier to navigate quickly.