Fire wood anyone? This is kind of a big piece to have found its way in there by itself. I'm thinking someone stuffed it in there to make a rattle to screw with their buddy.
It's been slow progress, but I finally got the rocker area done on the drivers side. Now to patch in the seat belt mount and finish up the floor pan, then cut the fenders out a little to match what I did on the other side.
And finally some good news. I cut the windshield out today to find that the frame isn't nearly as rusty as I thought it might be. Pretty heavy surface rust and some pitting, but nothing that requires total replacement.