Rear Cab Corner Replacement - Fill with Fiberglass

[68blackbird]

Not sure if it was best thing to do, but on the '59 I did last year, after replacing the corners, I sealed the hole with POR15, then filled it with expanding foam, trimmed, tacked welded metal piece, then used seal seam to finish it off. Now, I have a plasma cutter and was going to make one, but was fortunate to have access to a CNC plasma cutter, so gave them my cardboard template and they cut 4 pieces so I could do top & bottom.