I don't think the floorboards (not sure about the rockers) are that had to fix but the rust around the firewall could be a real pain. I'd be worried that the seam below the firewall under the fender is rusted. I saw that on a VW I parted/scrapped. Repair is possible if there's rust there, but the fender/dash would have to come off and it's a pain working w/ all those angles.