Nice Robin. Let us know how it turns out!
I was thinking that with the increasing popularity of 3d printers that might be the way to go. Have it print out the hill with slopes from one contour line to the next then glue the photocopied map onto it.
It's too bad that AP didn't have the Cassino map done in 3D at the time it was released. I think it would have helped sales.
I can see some issues with this. If using plexiglass they will have to sit on top of the glass. They are going to be easy to shift around by mistake. I'm thinking of maybe trying to get them to stick with some sort of putty.