Here are some pictures:
This picture shows all of the foam risers installed, this is a 4x8 layout for HO
Next I installed some flat foam, and tunnel sides to keep the trains safe as they go through the mountain You'll notice that I've formed newspaper balls under the layout. This allows me to get a very organic shape, quickly and easily
I hope this helps!
The plaster cloth goes over in at least 2 layers, in some spots I did 3, but the entire thing is fully plastered here, and painted with a wash of coffee and other watercolors. I just splash the color on the sides and let it run down and blend together.
Now I just added the beginnings of foliage, ballast and track. Things are starting to look good
Proto 2000 DCC w/ Sound Conrail engine running on the layout. Notice the lights are now working across the layout. It was a real pain feeding the wires through the layout. I used a coat hanger to feed everything through.