The original trunk floor doesn't extend out as far as your panel in pic 1 shows.
The piece you fabricated is actually part of the rear panel of pic 2. That panel extends under the bumper in the shape you made.
Confusing?
The piece you have to make bends outward and is welded to the trunk floor that extends about 1" outside the trunk.
I can email you some pics of what I'm using to follow while I repair mine.
It will be a lot clearer seeing some pics.
The piece you fabricated is actually part of the rear panel of pic 2. That panel extends under the bumper in the shape you made.
Confusing?
The piece you have to make bends outward and is welded to the trunk floor that extends about 1" outside the trunk.
I can email you some pics of what I'm using to follow while I repair mine.
It will be a lot clearer seeing some pics.