Slaved over the car some more today.
Here's an older picture showing the nice surprise behind the sheetmetal where the k-member mounts to the frame. The driver side was even worse.
Here are the tubular framerail supports
And then the framerail without the supports
My solution to this was to clean out the framerail, apply anti-rust paint, make new supports, weld them in, paint again, and then weld a new, stronger piece of sheet metal in to reinforce the framerail.
New supports
After some painting, welding, and more painting
Driver side
I figured that a good portion of the rust was to blame on the holes in the framerail directly under the strut tower. This area is constantly exposed to the elements while driving, so I decided to weld those holes up to eliminated the possibility of water sitting in that area anymore.
Here are the new pieces of sheet metal that I'll be welding in to box the framerail back together.
I also cut out and mocked up the passenger side sheet metal behind the strut tower. Didn't get around to welding it in yet though.
The last thing tonight was welding the pinch weld along the firewall. I had already trimmed it back to make it look a little better, but the two pieces of sheet metal were still visible and that was pissing me off, so I welded it up. It will be grinded down nicely and be given somewhat of a rounded bullnose edge.
I still can't believe how much work there is still left to do in the engine bay. Everytime I look around I find something else that needs attention. One day at a time!