I did the patterns myself I Corel draw. If you have Corel draw I can send you a copy of it but you would have to had bridges to it as I do. I can' seem to save it as any other file format only for that program.
Finished these two up yesterday. There 8.5"×11" made from 1/4" birch plywood and 1/4" painted black. The corner pieces are 1/8" birch plywood. Couple coats of spray polyurethane to finih them off.