My truck has a home built (built by the original owner) flatbed. He really did a nice job with rough cut chestnut, but some of it is rotting. I want to replace the wood, but salvage the hardware, and copy what I can't save. I plan to reduce the size slightly, and make some subtle changes. I only know a little about rough cut lumber. Any ideas on where and how to buy it? What's a good replacement for the chestnut? Were there plans available back then or did he build this from his own design?