such as the RBW MGB Roadster.

Retailing at about 100k £ it is built from scratch with all new components, including a new body built to original specs with original tooling, while their Jaguar E-type conversions are converted in a way that always allows the return to original specifications. The electric components are built by Continental so no back-yard improvisations.
I dream about a re-edition of this though:
Then it could be parked on any street without worry, driven in rain, snow and dust.....
Cheers from Switzerland
Richard