Just a couple of minor corrections, for the record (I did this project a year ago, so mis-remembered a couple of things). One is that the cutout patterns were, I believe, 1/4" ply, not 1/2". Two is that I didn't ream out and backfill the core on the hatch lids (I did do this on the berth flat portion of the opening though). On the hatch lids I basically just "painted" the edges with epoxy, then, IIRC, some thickened epoxy, after which I rounded them over a bit for pleasant handling and finished them off. After all, I may (or could) replace the lids with plywood or etc. later on.