Elevators - Having Trouble

Been fiddling with Elevators a bit, trying to make an Arena.
I read this Tutorial extensively, but having a few other problems.

Problem 1:
The edges inbetween the cliff/elevator act a bit strange, i.e. a unit walking through will dip down then backup. It does not effect movement in anyway but visually it looks pretty bad.
Checkout this screenshot:


Problem 2:
Units can walk down the corners. It won't let me place extra elevator walls & can't squeeze enough pathing blockers.
In the screenshots, you'll see there are still blue areas (walkable areas) in the corners, which I can't block, although I attempted to block the right side, but failed:


thx for any help/advice.

Use invisible platforms instead of elevator walls; solves both problems as you can set the height to be the same as the elevator/cliff, and you don't have the pathing collision the world editor won't allow.

Problem 1:
This is normal. If you want to make the units stay on the elevator, you can just move the elevator close enough to the cliff that one of the edges is lost in it. (or you could try alexander's example)

Problem 2:
Move the elevator out of the way, then place an elevator wall parallel to the existing two. Then double-click and increase/decrease it's angle by 90 degrees. Do the same on the opposite side with another wall. If you line them up just right, you should get a square box. Finally, move the elevator back in place.

Or you can hold down shift and place the extra elevator walls.