F1 steering wheel replica.

F1 steering wheel replica. drawn from a photo of the 2013 Ferrari wheel.
I will scale to approx 200 mm x 125 mm when i print. The knobs will need scaling, but not sure until i print the wheel what size they should be. holes in wheel should suit M3 countersunk screw, this is what I need to check.
MK2 version is in progress. This will have moving paddles and a stand.