Its got some extra cross bracing in Andy but also is made completely out of 2mm thick box section rather than 1.6mm. The 2mm box gives a lot stronger and rigid chassis and a lot better, stronger, welds.
You are correct about the Haynes chassis but this is more of a disclaimer for Haynes and when you compare the chassis to other cars taking similar power the Haynes design is as good as if not better than these.
Cheers.....AndyH
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