Paul I thought about going about the rolled edge the way you are thinking but a problem i thought would happen is gravity would pull the fiberglass down from the underside before it dried so would need supporting in some way.
This is why i used the oval section plastic conduit bought from B&Q for £1.70 3mtr length (tried to find a link on the web for you but no luck, the 3mtr was cheaper than the 2mtr at my local store) i then stood it up by screwing an L shape bracket to each end then covered the full length in brown tape and then fiber glass matting so that each side and one oval surface was covered if that makes senses the other uncovered oval surface was face down on the floor, then trimmed one of the flat surfaces back to the start of the oval curve, the flat surface left was used to stick and screw to the cockpit perimeter until dry.
Any way i am sure you will come up with a great idea and i look forward to see how you tackle this.
Cheers Swifty
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