This has a lot of potential, and I love the z-axis stuff. I think it needs some work, though. Main problems:
1) Too much junk in the way. A few less boxes and barrels, please, it's too claustrophobic and this makes for constricted flow and bad gameplay. Even playing it in Action Half-Life, where I can climb, dive, and hop up off walls it was a pain in the ass to get around.
2) Connectivity could be a little better, it's frustrating being in a room where there's absolutely no way to reach the catwalk above you etc.
3) Lighting is too dark in many places. I'd brighten it up a little, maybe add some env_glows around the lights for bling.
I'd show it on the forums to get some feedback, then maybe release a "mesa_stor_v2" with the improvements. I really think this map has potential, but you should open it up to constructive criticism if you want to make it the best it can be!
