Though I never built one I LOVE the concept of the Puddle Duck and the crazy people who actually DO build and sail them.

Yeah, that would’a probably took a bit more space than was set aside for the article. Basically it was a 3″ and a 4″ black iron riser coupled together, and then 1/2 iron elbows. You might get a better view of that portion of it at this link:
https://www.fightbackinsac.com/forums/forum/socializing/the-great-outdoors/24608-home-built-paddle-wheel-boat-build
Otherwise, I can coach you through it. I’ll say that was a bit complicated because I was flying blind. I tried to get a local machine shop to bend some rod into that shape, but they tried and failed. It was too many bends, too close together.

Scott,

If you haven’t already found the article in “The Nature of Boats” it begins on page 71. It’s a delightful little boat. I built one about 10 years ago for kids in the family and they loved it, as did the adults. With a seven-year-old for motive power and a 150 lb adult along for cargo it moves easily. Lots of fun and wet which is what summer on the lake is all about. I changed to crankshaft for hand cranks on each paddle wheel. That worked well and was easier to make.

I looked through that a bit, but didn’t see the one you mentioned