Well Ive started and stripped her down. Took all seams to bare metal and caulked with 5200. Takeing the outside rivets and caoting them with rustolium truck bed liner. Right now im trying to scrape the carpet glue away from the inside eams and rivits. Im going to try and post pictures. Has anyone ever seen a drain plug like this? How does it work, should I cover it up? Or use it?