Modified the previously fabricated engine control 'sub panel' (below the panel) attach point. Mounted on the backside of the panel, and passing the cable controls through the slot, this will be detachable if the panel is removed. (Cables can be left in-place).
Hand filing and shaping the slot to accommodate the passage of knobs, AND securing the attach plate to be stable. (Baggies to protect the knobs during fabrication).