Ben. First off, welcome aboard. Glad you discovered the most exciting aircraft available.
Second. The double throttle has been done. Ends up, in my opinion, being a complicated solution to a non-problem. Also location of a 2nd throttle makes ingress and egress from the cockpit a little more difficult as they will stick out into the door opening some no matter which side it is located.
As far as the building part, you've already cleared the hardest hurdle in the entire build process. You got the go ahead from the wife. The rest is completely doable. Enjoy the forums. Lots of skilled people here to help you if you need.