Well, I’ve assembled some things!
Unfortunately, I think I’m going to punt on the 1” shaft Tecumseh, as there’s not enough clearance between the jackshaft and swingarm “pivot” to mount the bigger JS sprocket needed to compensate for the larger sprocket found on a 1” clutch. Additionally, the cost of sprocket parts would likely exceed that of a used engine with the correct 3/4” shaft. To that end, I have a nice Honda GX200 that I can press into service. Not necessarily the right look, but it IS a nice looking engine! Much easier for me to just bolt that in than find a 3/4” shaft Tecumseh engine off a snowblower (that will probably be red or something) and convert it.
Also, I have to make myself a new brake bracket for the rear band brake. I had to buy a new drum for the rear (the old one was missing), and ended-up with a 5” model because it had a 3-hole mounting option. The original bracket is for an 4”, and all the 4” drums I could find were drilled into 2 4-hole patterns. Wasn’t too certain if I could accurately drill a 3-hole pattern in one, or even have room with 8 holes already drilled in. Also, I’m missing some of the other brake bracketry, all the chain guards, and the fenders are cracked and bent. Will have to get busy fabricating/fixing that stuff!