I'm referring to the original Roadster being built on a heavily modified Lotus chassis while the Model S was ground up design. The fact that older Roasters can

I'm referring to the original Roadster being built on a heavily modified Lotus chassis while the Model S was ground up design. The fact that older Roasters can get upgrades from the Model S suggests a good deal of component sharing for the drive trains. I'm not sure if anyone has written anything extensive on it.