We attempted to play this earlier... (a3a), but the server kept crashing (not your maps fualt, just EU being pants).
One of the things that bothered me is that when the elevator gets below half way you take quite a bit of fall damage, particularly for a legitimate gameplay area. As BLU you need to fight through RED before dropping down to reach the elevator, and i should be able to push the cart as a reward for fending off my enemies and progressing. But more often than not players would drop down and die from taking fall damage. Or survive with such low health that a stray bullet/grenade from above grazes you to death.
One solution would be to make the elevator lower half the distance but at half the speed (so you get the same combat value). This would also probably make your map feel like there's less of a monolithic height issue. Another would be to have the drop distance split between 2 elevators.
Also, when people reach the bottom of the elevator, they all run into that closet room on the left thinking it's a shortcut.
On a final note, the scaffold just beyond this sections seems mighty tall.