The idea of the Roadster is that is light and nimble, by adding a pressed steel sub frame to a light chassis it would seem to defeat the object of the design some what. There is a 7 design that uses the rear sub frame but the name escapes me at this point.
There is of course the MEV Exocet that uses the both the front and rear sub frames including the the back bone, a tubular frame is then dropped over the top but that is a different beast all together.
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