Probably the easiest way to get a nice-looking, smooth hinge is to just let the middle section bend. If you have a fiberglass or lexan piece with a gentle bend across the top and the edges bent down, you can bond the whole front edge to the roof, and then cut two t-shaped slots in from the edges near the top. When you lift at the back, the center section, between the tops of the "T"s will buckle to flat and make a fine hinge, and still snap back to give good beam stiffness when down.
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