Gas tanks strap mount points

Those are for the tank, but I don't think its original. Is that just a plate welded to the floor pan? If so, your depending on the strength of the little bit of sheet metal that the weld grabbed. Which is why one looks like it got ripped off. I don't know if they ever did it that way. Did sombody already replace the spare well, that would explain a lot, cause it looks like the pans in good shape. Here's a pic and quick sketch to clarify what I have. Same car as pic above from in trunk with primer. The three pieces were originaly 'spot' welded together, but can drill and fill or just weld the edges. I think they are a little heavier than the trunk metal, so I'm guessing they are 16 to 18 gauge (anybody know for sure?). Then the assembly is dropped through the slots in the pan and you can again drill and fill weld or just tack the edges so it can't move. The structure is in the 'T' hanging in the pan, not the welds. Then it just gets seam sealer over ends to fill any gaps.