[the Carpenter]

Personally, I favor a func_platform for elevators.
It's what was designed to be elevators, so why not use it ?
Of worthy note:
ALWAYS assign a player damage value of 1 for elevators, otherwise you can be stuck on them, indefinately.

Re. The Map:
Good choice of textures, for the most part, but the lighting needs a LOT of work.
Great start though.
Cheers !