Floor panels

 Starting with the driver's side, the carpeting was completely rotten, so when I removed it it just came out in shreds and crumbles. Then I saw that the floor was stangely distorted. At first it looked like it was bent up. But then I realized that it was just a very thick layer of tar that had been distorted by the driver's heals resting in the same spots. All the flooring tar was removed using a heat gun and small trowl tool. Then I went over the rusty areas with a needle scaler, which reveled the full extent of the rust. Where the tar had compressed under the drivers heels, it had formed a bowl shape that evidently served to collect a puddle of water, as that's where the worst floor rust is. Interesting thing about this rust spot -- it can't be seen from under the car because it's over the frame rail boxed section.

There's more rust at various other locations. The rear of the floor isn't terrible and could be patched, but I'm just going to replace it entirely. The forward lower edge of the tunnel will need patching as well.

 On the passenger side floor I got a lucky break -- no rust repairs needed. 

 

 A view into the underworld.