Hi CH, this is your idea represented in 3D model. It is a compact drive. All battery, motor and the gearing are aligned to the middle shaft. It is anchored to 2 places, the middle shaft and the drive hole where the paddle are place. If this entry is selected, I will send you a refined version with a drawing that you can send to metal shop to fabricate. Thanks you so much for the rating. #ratedontreject.