Using the prop shaft tunnel as ''backbone'' for body structure

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marellasunny
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In regards to the Lotus Elan from 1962, my book H-point says that Colin Chapman used the prop shaft tunnel as ''backbone'' to the body structure. Can someone please elaborate on this?
Does this mean that the structure of the prop shaft tunnel acted like a stiffener for the entire body structure? Kind-of like folding a piece of paper in the middle.
 
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