It all depends on where they measure the chassis from, I did mine the old fashioned way, dropped a plumb bob from the 4 wishbone attachment points on the 4 corners and then measured diagonally, 1 mm difference, so you also measure left side and right side, should be with in 1mm also, I have only experience with one chassis so far. Ask your guys where they are measuring from, Where did you damage and how,Post some pics of the damage front and rear sections are replaceable. As far as I can make out the chassis are pretty good, within a couple of mm, the final machining of the panel fixing points aligned everything..