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Agree that plywood can have a long life. I've seen an anchor hatch cover from an aftermarket supplier made up from solid strips about the width of wood flooring backed by two transverse pieces, one forward of the cover about three inches from the edge and one aft also about three inches from the edge. If all that is required for the hatch is a few square feet the cost may be a toss up. It was available in four or five linear planks width. I prefer the five plank version as the finger hole is located in the center rear of the middle plank.