I'm taking my first real swing at repairing rusty panels. I've managed to stick to paint and dent pounding up until now. And this repair has things that puzzle me.
First, the original boot floor corner (where the rear subframe mounts bolt up) has a construction that I don't see in the body panel diagrams offered by vendors. In particular, the metal has three layers (boot floor, a gusset of some sort, then the closing panel assembly.) Looking at all diagrams, there are only two layers (floor and closing panel.)
If the middle gusset part should be part of a replacement floor, then the corner repair pieces I purchased just in case don't have it. 1st pic outlines the area I'm talking about. I have seen this extra plate on other pictures of floor repair work. What is it?
Next, I bought some corner repair panels just in case. These panels lack the reinforcing gusset mentioned above.
And, the right hand panels have a stamped recess for the wheel arch bracket, which doesn't appear to exist on the original boot floor (hard to tell because of the rust, but there's no recess.) And the left rear corner boot floor panel has no recess stamped in it! What is this recess for?
I can't tell what purpose it would serve. It doesn't seem to facilitate the arch bracket, and of course the left side doesn't have one at all. One is a Heritage panel, one is a Magnum, both have the stamped recess on the right side. Magnum left side has no recess.
Finally, the corner repair panels have a flange around the perimeter which would imply to a novice like me that this is meant to facilitate spot welding. But it wouldn't look original. It almost seems like these panels should be inverted so the flange points downwards, hiding it below, if there's something to weld the perimeter too. I probably will not use them and instead just cut a repair floor piece myself, if I can figure out the mystery of the gusset.
So to summarize:
1) What's that middle gusset plate, and where do I get a replacement if it's needed?
2) What is the stamped recess in the replacement right corner sections for?
3) Does the flange mean these corner sections should be spot-welded in along the flange perimeter?