Following your progress intently. Your driver side looks like my passenger side. The tunnel patch and seat bracket look great to me, but I've never touched a welder!
Am likely going to pay someone to do it for me, but at least I have some idea of what things should look like thanks to your efforts in posting this thread.
I've currently got my interior stripped to the metal, save center console w/carpet next to knees, driver and rear seats. Quick aside - CAREFUL with the bare metal under the rear seat. I put mine back in just so I could put things back there without the screws that stick up puncturing stuff, such as a 2 liter of Coke that went geyser-like while I was making a turn...
Have gotten most of the passenger side rust scraped, chiseled, and wire-brushed down to hard metal edges everywhere, and hit it with some phosphoric acid based rust stopper for the time being. Have been unsure of how to approach the actual repairs though - fiberglass, epoxy, por-15, weld - ugh. After this thread welding it is, even though it's the most expensive and, in my inexperience with such things, seems like the most hassle.
The passenger side I understand on mine, it started in the hood hinge pocket. The driver side I have no real clue about - only the spot where the accelerator pedal hinge attaches rusted out. Haven't spent as much time on that side though, hope to know more once I get the knee-level carpeting out. Do I have to take the console out to get it loose? I worked a little at the passenger side with no luck and don't want to force it.
Thanks again for sharing your progress and I'm definitely cheering for you (college AND the car)!