David: I was not familiar with the kind of check valve you installed for the anchor locker. Can you recall the manufacturer? I have never seen a flat one like you appear to have. Or maybe I am misreading the photos..How much of the chain locker did you lose by putting in a floor?
I did the same as you on your padeyes for my stanchion bases. I noticed the flat part of the bases were bending outward. I had my machinist add 1/8" stainless to the bases and then I had him make threaded backing plates that are glued with Sikaflex adhesive to the inside of the bulwarks. Not an easy job to access them all to get the old bolts out. On several we had to drill out the topside part of the bolt. And, amazingly, no two of the stanchion bases had similar hole spacing. Each backing plate had to be matched to the particular base. Hard to believe the firm Morgan hired for the stainless work did not use a jig of some sort. Then, since I had assumed they would match, I had removed them without marking them, so we had to match each to the bulwark locations.
Finally, after seeing how much water goes down my hause pipe offshore, I am going to plug it somehow; for long trips, probably take off the chain and use one of the new little orange rubber plugs. Or I may try modeling clay.