Well, this isn't a mountain but I built this setup for my wife a few years ago. The base ia a 4x8 sheet of 2" pink styrofoam. I cut the edge in a random pattern with a hot wire cutter, carved out the river and painted it several shades of blue and then poured clear epoxy into it. Painted the rest of it flat black, and added the brown road. I built bases for the larger pieces in the back to raise them up a bit. All of the light posts and smaller light up pieces are permanently attached to the base and wired together on the under side. The cords of the larger pieces go thru holes in the foam and they all get plugged into several 4-ways, then all the cords are connected to a single remote for one-button instant on. This picture was from a few years ago and isn't the best, I can't seem to find any others right now.