We're working on this project now and have the impact surface designed but need to design an impeller that can be built by the farmer.

Video  our Thomas International impact huller with a DC battery powered motor and a rototiller motor with the motor still mounted on the rototiller.

Video of a homemade grain de-huller using an impeller from our Thomas International impact huller

Video  our Thomas International impact huller with a DC battery powered motor instead of the AC motor