A curve is certainly the best, but not the easiest. If you go with a couple of angles, do no more than a 5 degree change at a time. It will separate and then re-attach if you keep it within 5.
Making 3 panels with two angles each, and a pair of top radius pieces to join them and you could take it down and put it up, and store it flat on the back when you did not want it sticking out there.
you could build it all in one piece with 1/8" or 1/4" foam and glass/epoxy, and saw it apart and make connectors for it. Lots of options.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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