[frayed_knot]

There is a 1" lip all the way around the deck (see it in the pic), That's why I went with a 1" gap. Keep in mind, that the gap will be larger by the time the edge gets to the lip (angled cut). It looks like the edge of the cover just rests on the lip. I should have plenty of room. I could just sink some screws into the screw holes for the access covers and set it in place before glassing just to make sure. Thanks guys.