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I would not keep that bracket. Im surprised it hasn't torn off the transom. The spot where the bolt/washer broke through the hull is where the transom gets fatter and joins the side of the boat.The 2"+ piece of plywood that spans the transom ends before the bolt. There is only foam there and the glass isn'y very thick there. And that bracket Im pretty sure is hollow/ no foam. You could probably sell the bracket and spend the money to fix the floor.
I wish I saw this boat a few years ago when I was looking for a boat to fish and pull lobster traps out of. I saw one just like this with the cap removed. It needed a new tank cover and front hatches to make it into an Outrage. I had the console. I just made a new tank cover for my 1977 Outrage 21. A piece of marine grade plywood painted with resin wood last for years.
Red dot hulls are rare and if you ever run aground or get hit or hit someone you will be glad as Whaler hulls aren't very thick. A nice 13' Whaler will cost you more then this boat,let us know how you do.