Are you sure you need dual pinions if using r&p?
I think the more common option is to spring load the pinion against the rack.. have you checked cncrouterparts design with a pivotplate or the mechmate as it uses similar design.

And I agree about your fusion skills! Impressive!
I find solidworks much more intuitive but I have a really old version so I guess fusion tutorials are on that to-do list ;)

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