Nice set of 1970 plans but time has caught up with things like this. It would cost $700.00 to $1000.00 to build that little mini bike today. And that's in used parts that you spend so much time finding.
When I had my store in 1973 a man came in with a mini bike that was 1/4 that size and I watched him ride it. But he was lets say NUTS and very limber. LOL .
Thanks for the look back. Steve