Fascinating man!

He also designed and built this smaller single engine, land version:

1479465.jpg

There's a full article somewhere on it, that I can't find right now with full specs and interior photo's.

And this one with a very cool wing design: http://www.airbum.com/pireps/PirepEllipse.html

Last I heard he still owned both prototypes (not sure though).

He is also in the EAA Hall of Fame.