A 3D elevator certainly makes any map more interesting. Especially when multiple floors are involved. However, to make it interesting, ACS scripting must be employed to have the elevator go to specific floors. For those interested in constructing such an elevator, Rex made a detailed tutorial to show the way.
My example simply goes up one floor when the elevator is entered and down to the bottom floor.
And what it looks like:
Example pwad: 3D-03.wad
Kappes Buur, Sept. 09, 2017