start here on my
photos click I fixed mine with a piece of filing cabinet I scrounged. But I know others would like to have them.
Looks like your repair turned out well, just missing the bead detail at the bottom.
The trouble I would see in making these is the next guy would need more at the top due to more rust bugs, so where do you stop? In replicating this part you practically need the entire cab of the truck to have a good pattern, insure you get the fitment perfect, and have enough made to fix all the rust. This IMO is not a good candidate for a "mail order" replacement part, since unlike the fender brace, it's difficult to send someone a sample of the entire piece.