Keep us posted on if you get vibration. Is that POR 15 you are using? Original seat and seat mounts are long gone in mine. I'm putting FJ55 front bench in mine (couldn't find a fj45v seat). I have had the seat mounts cut out from a donor FJ55 floor which will be tig welded in. I'm currently rebuilding my sills out of 3mm steel. It would be more a rock slider than sill.