Birdhouse, the large, thick bath towels I have been using cover the bottom of the cage perfectly, size-wise. He does chew on the towels, so I suspect he'd chew anything else I tried. He hasn't fallen often, and the towel seems to provide adequate cushioning when he does. Since I'm retired, the extra laundry isn't a real problem.
Murfchck, ha to the boar! If you lived in my area, you'd have plenty of people anxious to have a bbq...