I've been thinking of doing the same. I recently redid the standing rigging, stanchions and lifelines and asked the rigging co about installing a windlass. They said they would cut the chain locker hatch top into fore and aft parts. They would reinforce the half where the windlass would go with steel to the deck and have it drop into the remaining half that would be hinged.
Originally I was thinking about a fiberglass shelf but don't know if there would be enough drop height. Cheers, Jeremy C&C 34-1 #041 Vancouver BC
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