As promised, here are a couple of pictures of the terrain boards under construction.
You can see clearly here how the 2" foam sticks up a bit above the 1" x 2"s that make up the framework.
Hopefully this weekend there will be time to get some hills glued down and some terrain features carved. I am also working on an idea for a frame to allow easy transport of these boards. I think I will use some removable posts at all 4 corners to allow the boards to be stacked, while maintaining enough separation to keep the terrain from getting damaged in transit. We'll see how it goes.