It looks like you also need longer M6 bolts for the motor mounts as they mount on top of the base panel. I am using 6mm panels so I replaced the M6x20 with M6x25 bolts.
Red Cap Screws are M5x12 (not M6x12). It is correct in the pdf but incorrect in the dozuki figure.
For 400x400 variant, the diagonal lengths as shown in the diagram are 750 = sqrt((550-30)^2+540^2)
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