Two more images to tide everyone over until I can get Tutorial Part The Second shot & assembled.
Flickr Photo Link. The hill is two layers of 1" beadboard foam (white styrofoam, not the nice pink/blue board) on a CD; the roads are CD-based; the jungle foliage - 14 bases of it! - is on thin plywood shapes bought from the local craftstore. These work nicely, but they're thicker than CDs and they actually cost money, unlike free recycled CDs!
Flickr Photo Link. Three CD-based road segments - the foreground one has been seen before, the middle and rear ones are new. The rear one is a three-way Y intersection, which is going to force me to make at least a couple more road segments - I'll probably do some with the road fading out into grass/foliage, so I don't have to have every single road going all the way across the playing area or ending randomly.