I finally finished and installed my new starboard crib boards over the weekend and am pretty excited about how well they turned out. They aren't perfect but are way nicer than the disintegrating painted plywood boards that came with the boat. The exterior handle is a 316SS grab handle that I bought somewhere, but the locking mechanism, vent, and interior handle were salvaged from the old boards. The receiver side of the deadbolt was basically "freehand" with a trim router. I haven't used any sealant anywhere yet, and hopefully won't, but the top of edge the vent will probably need a bead.
Pics here