Aircraft styling and power were big back then. The V twin MC engine was a spin off from the radial aircraft engine. The flat opposed twin like the BMW Boxer was Aircraft inspired too.
I found a Speedster drawing with that approach. I've been around some fabric wing aircraft stuff a little, and Its durable and strong. Just build a electric conduit body and sew a fabric (stitz?) cover and dope it up & It'll shrink to fit--Gotcha a racer.
PA41