Rot question

I had upper control arm mounting tab rust off on mine. Used some flat steel and angle iron and welded in some bracing. It’s not pretty but it is solid. Mine is just a driver, so I don’t care about perfect. As mentioned above, if you can get back to some good metal, with a torch and a welder and a little improvising, you can probably fix it. I am not high skilled at all in metal fabrication, but mine worked out ok.