Christian
The frames on the Camel RIBs were custom designed and built for the event. You are most unlikely to find them by mail order.
They were produced by an engineering company who are used to making components for RIBs, but even so they haven't been problem free --it will be interesting to see how well they survive the next couple of weeks!
Carrying windsurfers would be the tricky bit; for sun protection it would be quite simple to fit a "T" top as seen on a lot of American boats.
John
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John Kennett
RIBnet