Interesting. As I was going through that step I was a little concerned about the level of strength the joint would have but I didn’t even consider the plywood lamination. That’s crazy. I had seen a few others that had a similar issue and it seems like in all cases it is related to the weight of the battery positioned at that point. For this reason, I made the decision that I am going to put my battery up forward in a trailer box, leaving only the cooking ‘things’ on/in the galley.
At any rate, good luck, I’d be interested to see how the repairs goes for you.