with the unique shape of that hatch, I would try making a minicel cover for it that fit within the recessed area. make a cardboard template, trace onto 2" minicel and carefully cut out with a bandsaw. then you could use a router or dremel tool to cut a groove for the hatch lip to fit into which should be watertight when strapped down. if you took the time to bullnose the edges and maybe even make a plastic piece to glue on top matching the color of your boat, you could make a pretty nice looking cover.
URCHIN Portable Anchor
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