Hhmmmmm, let's see. The string could run down through the inside of the limb and be attached to the motor that winds the string to bend the limbs. Yep, good idea to cover the back of the bow with solar cells to recharge the storage batteries for the motor. Good collaborative brainstorming. But, what I haven't figured out is the demographics of the market that you would sell to. Could be an interesting challenge. Go for it Marc.