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Hi Dave,
Do you need the horizontal bar? The belts could just as effectively be located to fixings directly to the rear shelf. I am not overly impressed with the location of belts on the horizontal bar as it imparts a huge bending moment into the bar (the load would be ~6g for two 100kg bodies i.e. around 1.2T!) and the fixings on the main hoop. I realise that a number of competition cars have it and I can understand the theory where the only other fixing is on the rear seat deck that makes the belts overly long and operating at an angle. If I were choosing the ultimate cage for a bug I would still go for the rear deck fixing for the belts and then use a complete cross brace on the main hoop. No matter what I would still add multipoint fixings as Wally suggests to the cage so that the cage and bodyshell become a complete integral structure.
Clive
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