Here's a shot of the passenger side floor. I knew this was there and screwed down a piece of sheet aluminum a couple years ago until I could get to this point to fix it. Funny, the parts car on page one had a large hole in exactly the same spot. My guess is that because this is right above the gynormis factory cat, I'm thinking that the cat got hot enough to cook off the under coating, and the salt they use on the roads here in winter just took it's toll over time. With the school shop tools handy I'll use the bead roller and brake to make another insert out of 16 ga sheet steel and weld it in properly.
Unfortunately I didn't know this was here. The previous owner had filled the gap above the windshield between the roof and trim with clear silicone, a tell tale sign of a windshield leak. I'll bet that's what caused this. Luckily it hasn't rusted to the point that the floor integrity has been sacrificed so some cleaning with a wire wheel and some Por-15 should take care of it. I'll be pulling the windshield trim to patch up any problems around there.
The rest of the floor pan is luckily in great shape. Interesting how at the factory instead of gluing the jute pad to the floor they just slapped down some double stick squares and laid it down. Quick and simple.