haha yea i know, thats what happened with mine, similar sorta thing. we hadnt quite got the bows where they shoulda been before welding the roof on and some poor excuse for a panel beater tried shrinking (!!!) the steel in my roof to get rid of an oil canny bit and it all sunk down about an inch in one area, i was an apprentice at the time didnt really know the score and was feeling my way since it was a first chop, i coulda bogged it but my conscience got the better of me and i ripped it apart and redone it properly once i knew what i was doing after gettin a few more years under my belt. now i feel alot happier about it