The new same-craft part interaction in 1.7.3 permits a while range of promising possibilities, one of which is battery-free movement using existing stock parts and combining them with a DLC "housing" that moves with the part. As an example of this, I created a narrow-band scanner "motor" that has no electricity need, and has a very considerable torque. Although I haven't tested it's full capacity yet, the design is easy to emulate, with two structural plates attached to an unmotorised