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The BMW i3 is only a partially of CFRP construction and is not of the traditional form that you would describe a monocoque- it is essentially made like a stamped body in white, but with sheet-molded individual carbon fiber reinforced panels that are hot pressed in a tool and then trimmed and bonded together into the unibody much like a bonded hybrid steel/Al BIW is built. An all aluminum substructure for the battery and rear suspension is them bolted to it.
The cheapest production car carbon fiber monocoque that is a full, traditional style hollow-section carbon tub is the Alfa Romeo 4C. Nothing else comes closer as far as I am aware.
sc_rufctr: that MG SVR is purely a steel weldment chassis that has carbon body panels bonded to it. The main structure is not a composite monocoque.
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