That must give model aircraft accuracy fetishists apoplexy.That became apparent when they were upgrading the Nimrod fleet to the MRA 4 standard. As the wings were to be replaced, they measured one of the airframes and built a precision measured box section to bolt the wings onto. Unfortunately when they offered it up to the first airframe to get the upgrade (which was not the one the measurements had been made against) it didn't fit!
Back in those days aircraft were "coach built", you got a bit of metal and cut it to fit, then fettled it a bit to make it really fit well. After this discovery they went out and measured the whole Nimrod fleet and found out the longest and the shortest had 18 inches difference...