We prefer to supply chassis packs and chassis in 2mm wall thickness box section, as Adrian says it only adds about 10kg to the chassis weight but gives a stronger weld for builders and results in a stronger and rigid chassis. Especially good if you are going for the top end of the power scale, you can still make weight savings elsewhere - 700kg does seem an awful lot for a complete roadster, most seem to be coming out between 500kg and 580kg.
Regards...AndyH
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