[QUOTE=SailFastTri;890374]delmarrey you gave the best solution, IMHO. Good on ya!
Best strength for minimal modification to structure, and it does not need special skills to make it look nice. I would add that the OP should take care to smooth all the metal edges.
The metal bar behind is great if you can reach it. I assumed you could not so I suggested the gray Marine
Tex. It is metal filled epoxy
and rated for drill & tap. We used it for bolting on many parts
where we could not use a backer plate and never had a failure. In foam or balsa core
we made a special tool tohollow out a cavity 3 or 4 times the bolt diameter and packed the epoxy in - later drill through and tap. This is also good for making water-tight, crush-proof clearance holes for winch
mounting. Lots of good ideas here. I generally like to fix things only once so choose the one that is the most likely to never require attention again.