Hi Todd,
It is great to hear from you. The checkers is sure a nice flying airplane, congratulations to your dad on the awesome design. I'm sure it would do very well in the classic pattern comps.
Funny you mention a .40 size checkers. My dad built a .40 size version as well. I don't think it exists anymore though.
Do you guys still have the molds for the checkers?
Also, were there any later evolutions of the Checkers that you guys designed?
Cheers
Steve