Been working out where to cut, how much to keep, what to replace et cetera.
I plan on cutting the whole pan out along the blue lines (apart from to the right side, I’ll cut along the white line – this is the frame rail). Then cut out the filler panels on the red line (but not over the white line). Then the new boot pan will take the shape of the blue lines and the new filler panels the red lines. They will meet on top of the frame rail and both be welded to it and each other.
Here is my messed up shock mount, there are 3 layers of overlapping sheet metal to make up here, all three have practically rotted away. I’m thinking about cutting the top layer off along the red lines, and going from there.
Notice the hook in the background of the above pic, I’m going to cut around that just to save some hassle. Update: These plans changed slightly when I got underneath the car, there are some edges of sheet metal to cut around, and, stupid me, the frame rails are not straight along, they bend inwards, where the boot pan also does so…