Had a little more time tonight. So I started on a fender. This seems to be a common problem. All 4 fenders I have are worn from the front bumper in the same way. This one was the worst though.
Not perfect, but a thin coat of filler, and nobody else will know.
Went ahead and painted the inside of the fender braces with POR15 while I could still get to them. I put a hole in the bottom of the braces to let water & mud run out next time. I don't know what GM was thinking when they designed this.
I got one emblem hole welded up too. Now you see it.
Now you don't.
Here's a before pic I found.