[sunman]

The steel fabrication shop in Milwaukee that made the Excalibur mandrel bent frame rails is still in business. It would be worth the time to see if you could get some.

Bob said “I threw the cut up Classic Roadsters frame aside, redesigned it with one piece main rails and rear outriggers then changed the doors.”

I ordered the big block package it has about 12” width toeroom both sides.
I’ve seen carpet template photos here with a wider drivers side so I believe small block CR frames exist and all Excalibur were big block.