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folks with race cars have been known to use a sheet aluminum .062" thick or sheetmetal the same thickness as the roof. Cut it 2 or 3" bigger than the sunroof, then rivet it to the roof while using urethane or silicone calk, maybe auto body epoxy, to waterproof the joint. The rivets are zig zagged for strength and usually they will bend the panel to follow the contour of the roof.
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