RE: 23 pound twin
My one cent worth.
It would take two Axi 4130 motors, two 77 amp Jeti Controllers, and lots of research and development. If you are contemplating this, and you are the first to do it on that particular model, then the conversion will make you feel like you are re-inventing the wheel. I think Airflow might be low balling you, the cost might creep upward of $ 2,000.
If you have been flying this bird with nitro or gas motors already, I would not change at this point. With a bird this size the conversion should happen during initial construction.
Al