measuring the distances of that above shield -its wrong in top header length, its 39,69 while from mega reference design i get 39,37. And bot headers are not perfectly aligned with top headers as in reference design where the middle of bot a hole is in exact middle between two holes at top.
Seems that those differences of 0,32 mm do not matter, is that true, or did that guy have a hard time fitting the shield on the arduino and didnt tell, or are my measurements wrong?