This is what the underside of that panel looked like half-way through the scraping process of removing 80+ years of muck.
It was one of the messiest jobs I've ever done. It was pointless to use a stripping wheel as that muck just gummed them up. So a putty knife was employed to scrape it all off, then followed with some rolock stripping disks on a diegrinder. It pretty hard area to work it. You're laying down under the car why this crap rains down on you. Trying to reach around the driveshaft, swaybar and associated linkage.
After a couple of hours, and some cursing....it looked like this:
Besides the isolated line where the rust holes are, the rest is completely solid. Try to cut out that area only and weld it a piece is going to be a nightmare. Since everything except that isolated line is solid, I'm just going to weld a 3" x 48" long patch over the area from the bottom.
So I had to run out to buy a sheet of metal long enough.

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