does the y axis have to match the x axis when spacing the bearings and is it measured from center to center or outer edge to outer edge? reason i ask is because from center to center my bearings on the x axis is 200mm with 300mm long plates bolted to 2 bearing blocks but if i match the y axis to the same distance it is making my z axis plates wide and so making the total width of the machine wider which i don't want.

Thanks again