The rules are WB 140 to 190.... Modified Roadster has WB rules as well, minimum per engine size to 190 Max.
So if the rules look like you can take a lakester and make it a REMR it's because that's the rules. They make them, we just follow them if you want to run Bonneville...
Ronnie recognized that several years ago and made it work...
Jack could as well, he might have to make a different frame, or figure out a way to mod his, but he could....