As for the inner fender repairs, I got myself a finger belt sander that has helped a bit, but I'm still struggling with the cramped space and getting the welds nice enough. I think I'm going to end up getting it as best I can, building up the welds on the inside and outside of the panel before grinding it back and calling it a day with some seam sealer and a few heavy coats of Miracle Paint.
Here's where we started.
And here's were we are now.
The rust kept going all the way to the right where you can see the lovely booger welds. I've had to get creative on how to weld back there as the gun, my view, my welding helmet and a light all have to fit in a very tight area.
The reddish brown stuff you see is a metal primer that I used in a rush when I knew it was going to rain for a few days and I didn't want my work to get covered in rust. The car is under a nice thick tarp, but I didn't want surface rust forming. Whenever I work on a section I just wire wheel the primer away.