Considering Building Ferrari 488 Wheel - need help

As the title suggests, I am planning a potential build of a replica Ferrari 488 wheel to fit a thrustmaster base (for now). Trying to come as possible to something like this:
IMG_0967.JPG

I've identified someone who knows what they're doing to fabricate the frame but a few questions:

- any suggestions on diameter 300 or 350 mm? Is 350 mm too wide for Ascher paddles or other?

- was planning to use Knitter
IMG_0969.PNG

for the push buttons unless someone had a suggestion for something else.

- for the rotary switches I was thinking using cts encoders unless there's good reason to use a selector switch ( 12 position?) for some positions like mix or map.

- speaking of the rotary switches, any suggestions on a source for knobs that would come close to those on the wheel pictured?

- any other lessons learned would be appreciated

Thanks in advance for any help.
 
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