I pulled up the carpet and found three holes in the passenger floor board behind driver's seat. The body shop owner thinks he can patch it but he wants to look at it again. I think it would be better to cut out all the rust and weld in a new rear floor board. The piece is only $50 on Ebay. Is this a big job? They make it look easy on tv. The rest of the floor just has some surface rust. What do you guys suggest for treating/repairing the floor, front and back? Thanks.