Freqman1
Riding a '37 Dayton Super Streamline
I'd start with bars, stem, grips, seat, wheelset, pedals, and chain to get rolling then see what direction you want to go. BTW first time I've ever heard these called a "double flex". The bikes with just a front springer are referred to as "single flex" though.That's an option to start. But still need to looking for parts