That's #1 and Sir Norman Foster reproduced #3. I think #2 is the one that still exists. It would be trivial to reproduce the Dymanxion Dwelling Unit (DDU), there's only one custom part.
Just A Car Guy : every effort to make the air flow just right
It takes two pictures to explicate what going on on the airdam. Each plate is carried by little arms with elbows. This prevents blocking the orifice. But two of the arms have merged and skewed to tweak the air flow. Even the cast brackets get in on the fun.
I've always wondered about that single corrugation on the wing-tip. Perhaps that's so it points at the ground.
http://jalopnik.com/please-make-sure-to-convert-all-remaining-geo-metros-in-1750088665