I am looking to build a shed. I have access to scaps and leftovers from a local outdoor theatre. I get a lot of 2×4s and a few pieces of 3/4 plywood. There is usually also many sheets of 1/8 or 1/4 inch luan or floor underlayment. My question is whether or not I could double up these sheets to use as exterior sheet in on a small storage shed (under 120 sq. Ft.)? There is always Bgood amount if it and I hate to see it go to waste. Any other good ideas if what time do with this material?