One route to take would be to utilize the basic schematic from a late 1950s / 1960s era vehicle, stripping out the items you wouldn't have in a roadster. They will be 12V negative ground, use more modern type headlight and ignition switches, etc. Likely a better starting point than the 1932 wiring diagram.
This "Old Car Manual Project" has some diagrams on its site.
https://www.oldirononline.com/
Their offshoot that's dedicated for Chevrolet (gasp!) has schematics that include wire gauges.
https://chevy.oldcarmanualproject.co...ring/index.htm