I went ahead and created an elevator snap-in for you guys. Just open the file in the editor and copy the elevators from my file into yours and you will have basically a solid snap-in set of elevators that are pre-configured and set up. If you have any questions, feel free to message me.
The zip file includes a map, and all the source files I created to make this. Elevators are kind of annoying to make and they basically look exactly the same every time, why manually make them on every map?
Just change the game_text boxes to whatever you want it to say at the end.
Enjoy 

I had to decompile your bsp