I frequented a local moped forum for information. All they do is swear, buy and sell moped stuff. A lot of stolen items on board. Lots of pictures of nice 'peds, no pix of bright ideas. Not too many repairs, and absolutely no ingenious ideas or people interacting to come up with a better mousetrap.
I am debating buying a puch soon and am looking for a good project. I'm not sure of the engine or style yet but it's from 1980. good luck with the build.