Guys thanks for all the great replies. I would love to build a replica of the Piper Skycycle but as piper drawings were never drafted I am
On my own to come up with the structure underneath the skin.
I'm thinking tube construction for the fuselage and tail feathers and aluminum for the wings.

Al I have to go on are some 3 view drawings. I'll get a copy of that book and start reading. After I get something drawn up maybe someone could take a look at them for me. We are talking a pretty light and slow aircraft. Less than 700-800 pounds and less than 100 mph cruise.

Thanks again

Keith.