so was it the fact that the guard was only a repair part Sud that dictated your cut line? Many of the guards I have see (including my own) had died because of rust on the top rear edge, near the traditional antenna hole.
These sections don't get replaced in a patch panel like yours.
I'd probably be more included to fork ou the $2k if it was a complete panel, up to the spot welded flange.
Did you count how many tacks it took to complete?