[Merc Cruzer]

I did get the dimensions (2 1/4" X 40 9/16"). The owner of the car guessed the thickness at 18-20 gauge. I am thinking that 20 gauge should be stiff enough, since the piece is curved to match the bow. Minimal weight added to the top structure, but stiff enough to maintain its shape, without distortion.

Just a quick mock-up, using flashing, to see how far down the piece comes. It appears to be the width of the zipper.