The floor pan under the driver's seat in my 87 is headed to China. I'm a big guy, but damn! My old 84 didn't have the wierd rust problems that this one does. My front fenderwells are rusted something terrible, too. Anybody ever used fiberglass parts from US Bodysource? They've got both the pieces that I need, but I'm not sure if its the way to go. How tough is it to put new metal under the seat and at the body mounts in the bed?