Thank you all for the inspiration. I took a little of each idea, you guys are great.
What I came up with is simple and elegant. I am going to upholster it as soon as my sewing machine is returned. I made the structure underneath the board from 2 pieces of leftover conduit, then cut a 1/2" thick piece of red oak to the shape I wanted. It's held on with conduit straps. Nice and SOLID!