I wholly agree mazdarazmataz - I'm no engineer, but the MX5 is a convertible designed from the outset without a roof structure to stiffen it, so logically the structural strength must lie in the chassis rails and bulkheads. I struggle to see how the windscreen (which is acknowledged as a non-crashworthy structure) affects the body, although I intend to brace the tub where the lower edge of the windscreen used to cross the car. The strength must surely lie in the floorpan, transmission tunnel and bulkheads.
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