It’s not an issue for me as I will be making a custom enclosure but it was more to make people aware that it is not on the 5mm grid but I wanted to clarfiy just to make sure my enclosure and daughterboard all fit nicely together.
holes are approx. 3.6mm diameter. Roughly measured with digital callipers, the holes are 54.4mm outer edge to outer edge on the short direction, and 105.3mm outer edge to outer edge. So that means they are roughly 50.8mm and 101.7mm from centre to centre… what did you get from the diagrams? (ie I would almost call that “close enough” to the 5mm grid - surprised me, but the G400HDR was the thing that I now recall not being on those centres)