I know the feeling well, given a chance I'll make the mistake. I really like the modern lazer cut interlocking kits. They can almost make them fool (and me) proof.

Certainly Van's experience would let him know how to present his design to the average builder (who as we all know is a genius!) and eliminate most of the mistakes that would happen due to a slip of the minus or plus sign. I don't know if I would want to take on that chore as a kit designer especially when someone is going to strap himself in it and go flying.