Ladders look better. Still a bit thick, but at least they're within reason now. The stairs in the middle don't line up with the angled sides, and they're too big to walk up. Also, I don't think there's any CO2 in the map. I kind of like the idea of having to be conservative, but it probably won't go over well with a lot of players, plus without even the little canisters, it's possible to completely run out and not be able to shoot at all.
I made another demo. I forgot to point this out in the demo, but I think you should align the textures on the barrels to the high path.