I'm very interested in how this works out. I have pretty much the same setup; Pryer rear end from a Batavus going on to a Motron. I'll need to make the swing arm connection wider and get a chain tensioner as well. It does look like stock shocks will line up. Not sure how a stock V1 pipe will connect. Good to know you can swap the rear sprocket, though.
What are you referring to regarding a #35 or #41 chain? Do they not take a 415 chain?