New member on the hunt for the right coach

Dowels, dovetails, and dados can let 1/4" ply do a lot of heavy lifting. I'm also exploring aluminum composite panels 😁
Aluminum or cardboard honeycomb is great for cutting weight and keeping the stiffness. I've seen the dinette table replaced with a cutdown hollow core door. They'd drilled holes through the skin and injected spray foam, though I could see that blowing up on me.