I think it would be an easier job than installing two outer cab corners, especially if you have to cut out some hack's previous repair.There are bolts along the belt line, but the panels are also spot welded along the belt line as well. The complicating thing is the upper and lower outer panels are welded together first and then the inner upper panels are welded to the outers at the belt, covering the previous weld joints.If the upper part of the back panel (below the belt line) is sound, you could cut below the belt line and weld in the patch panel with a butt weld there and plug welds along the lock pillar.
