I finally got around to rebuilding my argo 8X8. The edges (lips?) of the bottom and top are warped, looks like a roller coaster front o back and sags on both sides of the behind the seat cross brace. Also the lip on both the top and bottom only on the one front corner on the exhaust side is bent down, approx on a 20 degree angle all the way around the corner. How do I go about straightening the joints to gain tire/track clearance and achieve a better surface for riveting the two pieces together?