mmm, I don't usually use elevators, but you have raised my interest. I'm going to have a play and see what I can or can't do. I'll let you know if i discover anything.
**edit**
OK, I got an elevator to go from the ground up to the first floor, through a frieze using cheats, BUT, when the door opens on the floor above the frieze, you can see the elevator shaft inside and when the door is closed, there are a few lines visible. Also, when the sim uses the elevator, they just pass through this piece af shaft as if it wasn't there.
The elevator seems to function as normal (I need to do a little bit more testing) but it's not very aesthetically pleasing.
Norma