I have a Mac 10 from the early 70's Which I think is 32cc that was almost unused that someone gave to me. You've just about described it in your post. I put a 14" roller tip bar on it and use it as a saw. I couldn't see any use for it as a airplane engine. The Mac 3214 14" (current production) saw that I have, has the Carb and exhaust correct but still the needle bearings. They both seem to have more gusto than a stock 32cc Mac Weedie. I've sorta thought about putting the 3214 chainsaw jug and carb on a 32cc weedie crankcase? The weedie crankcase strips down to look like a model airplane crankcase and it has ball bearings and a cantilevered crank. But the timing is rather mild.

Enjoy,

Jim