Just off the phone with Neugart. They say they can customize their PLE 40 gearbox to provide a longer shaft which would eliminate the need for a coupler. The shaft would also be prop-ready, threaded and drilled at the end.
There is a one-time $500 custom order fee for engineering and CAD drawings. Then the gearboxes would cost somewhere under $500 each. Exact price would be determined after they do the engineering and drawings. Delivery time for the first batch would take roughly six weeks. They may also be able to incorporate a motor mount for the SSS series motors. Eliminating the coupler takes away a frequent fail point. And a pre-drilled and threaded gearbox shaft saves a lot of hassle.
I’m definitely interested and would be willing to front the engineering fee. Anyone else?