ORIGINAL: hooker53
....wing cord of 10.5 inches and a rib thickness of 2.312 .....
Hold on a moment. That means the prototype has a 22% thickness? Unless it's a funfly type I think you'll find that your measurements are off somewhere. But it can't be a fun fly type as the aspect ratio is in the area of 6:1. Did you actually measure these dimensions off the plans?