The engine controls as purchased were laid out as called for in the plans. Unfortunately, this makes for a bit of a human factors dilemma in a Q2... The aircraft is flown with the right hand using the center stick. This necessitates either letting go of the stick to adjust the mixture or reaching across the cockpit and adjusting it with the left hand. It's important to note that the Q2 has laid back, supine seating as a result of its Rutan heritage, so this can be a bit of a lean-forward-and-reach-across type of maneuver.
I opted to follow single-seat and tandem best practice and move the mixture next to the throttle on the left hand side. Upon final installation, locations shown in the photo will be corrected to follow the FARs.
https://www.eaa.org/eaa/aircraft-building/builderresources/while-youre-building/building-articles/instruments-and-avionics/cockpit-standardizing-for-homebuilts?"Aircraft with tandem seating and single place aircraft may better utilize control locations on the left side of the cockpit compartment. The location order then, from left to right, should be throttle, propeller and mixture."