I have a huge inflatable Avon with a solid base about 7ftx4ft (plus hinged bit at the front) which is too big and heavy to safely carry on the roof of the estate. It already has separate slip-on metal side rails (why?) but I want to make a new base of 3 sections so it all goes in the back of the car. I understand having a rigid base is a bonus for speed and would like the new 3 sections to be held rigid rather than loosely strapped together. Being able to reuse the side rails is useful but I'm wondering whether to a) hinge the 3 panels in a 'Z' with the side rails to reinforce, or b) butting the panels with some sort of bolt or male/female connectors. The second doesn't sound particluarly strong. Anyone attempted anything similar or have any better ideas? It's only got a 25hp so it's not for anything strenuous, trailor not an option, and the whole thing is only for fun so nothing expensive. Thanks!