Pretty freaking awesome at least visually. The themeing is good and very consistent.
I think the curves is a few places could use a bit of work, most notably on the quaddamage platform.
speaking of the quad platform, it would be nice to see the floor detailing you used there a couple other places. Not extensively, but it could be used on a couple plain surfaces sparingly, like the bottoms of platforms.
I agree that staffy is a better looking skybox for the map, blindasky2 is a bit much green, the black gives a good background contrast.
on the outside path of the map i fell like i'm always in danger of falling off. IMO the outermost parts should be just a bit wider to give some more room to maneuver.
I'd take out the pistol ammo entirely. (except maybe the one on flat ground, which should have a little spawn detail to stay consistent) You typically don't run out of pistol ammo. otherwise the ammo seems okay.
normally 5 health would be a lot for a ffa map, but i think it works here because you need to work to get any of them, so you can't quickly heal without being an easy target.