In their search to find an alternative to drywall, the couple discovered this lightweight, nontoxic Italian poplar siding at a local lumberyard. "The Seattle Opera uses it for stage sets, and the lumberyard carries a large amount of the product to outfit them," says Pellecchia. Lite-Ply is about half the weight of conventional siding and can be fastened by staples. www.northamply.com/lit...