Here is a site that I do not think has been talked about here. This person is in my eyes a master boat builder, and has provided plans on the internet for boats made with plywood. one boat accually only uses a single sheet of ply. It has pictures and plans. http://koti.kapsi.fi/hvartial/index.htm If you couldnt tell by the domain, i have no ties to this person. Just a very informative site for those near water.