Seems like a fun project without too much investment. Bike seems to be in pretty nice shape. Used to see a few of these around in the 60's when I was growing up. Joke fodder at the time because they weren't manly and their top speed wasn't very impressive. But times have changed.
I thought I had Danu Huber's business card, and fortunately I do.
Danu makes some wonderful conversions, while remaining faithful to the old bikes. You don't know it's electric until it whizzes right by you.
Maybe he can give you some guidance.
He's in North Vancouver BC
His website is...