I wish I read your reply. I was in the same boat as you yesterday. They flipped not just one but three headers 180 degrees, the D14-D21, the D22-D52, and the D23-D53. I was making some changes on my design that I used this design as the basis. Found the mistakes. Please correct them. It’s sloppy. I won’t trust SPE design as much anymore, plus it took them years to finally add current limiting resistors on their serial 7-segment LED displays. Another thing is the bottom left screw hold is 0.05" off to one side. This works fine on MEGA1280 but in MEGA2560, the screw hole was moved 0.05" to the left and this shield won’t line up the screw holes.
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