As you all seem to be convinced I'm wrong and should use an off-center board on this camera I decided to take a photo of it.
I mounted a spare off-set lensboard without a lens on the camera and moved this as close to the GG as possible. No vertical raise given, all movements in center position. Then I aligned my camera with the center of the GG (the middle circle). The clear part in the middle is the off-center hole.
If that hole is in the center of the optical axis...
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