Hello All, my first post so I think I'll introduce myself before asking my question. I recently acquired a 66 Mustang from my father-in-law to restore with my boys. The engine and the front end is in great shape but the floors were shot. I also found the left rear frame is almost gone. I have replaced the passenger side floor with pretty good results. My question is, do I need to replace the frame or the floor first on the driver side? I would like to replace the floor first to keep the strength but I don't want the floor to get in the way of welding the frame assembly to the body. TIA for any help you can provide.