I used foam board( we had it already aboard from other projects). It took about two hours to make two templates ( large port and small port) I think it is as close as I can get it. I placed the board on the inside of the port then traced port shape from deck
. First on was cut too small, second one I cut big and just started slowly shaving. I also tried tin foil. Works great! But I don't think it would of shipped well. I'm sending the templates to schooner bay screens. Anyways, thanks for the input.