My daughters boyfriend works for an elevator company. They put up residental elevators in some very evry expensive homes. He brings us all the hugh pallets and extra sheets of plywood Some of it is 1 inch thick. The men load up the dumpsters and put his name on any peices they think he might use. You should see some of the beautiful wood he has gooten from the dumpster. The pallets are made with 4x4inch boards and are usually 6 feet long and 4 foot wide. Check out your local builders and companies many of them use pallets you would be surprised what you can build with pallets.