If somehow something has gone wrong with the starter hole placement, either at CAD or CNC stage then I only apologise and send you another plate, I can alter the position of the starter 'hole' but it would be good to know where the problem lies so we can alter the plate to ensure that it is correct. We know that the lower starter motor mounting hole is 'correct' as this is shared with a bell housing fixing, but the starter 'hole' and upper mounting stud can be 'swung in' to 'mesh' fully with the ring gear.
A good way of checking the starter 'mesh' would be to operate the starter solenoid, without the main battery feed connected. If you were to re-fit the starter to the plate once the gearbox has been removed then you could do this to check your measurements.
Picture of the flywheel;

TIM

















