Howdy,
I love that the LiPo Rider Pro has been designed to have the same L*W size as the batteries that you carry. May I make one suggestion? If the battery and solar connectors were recessed, and a small notch was made in the circuit board at each connector, it would be possible to make a form-fitting case that held the LiPo Rider Pro and a battery, with openings for the USB connectors, switch, and status button. The current placement of the battery and solar connectors, flush with the edge of the PCB, makes it hard to build a form fitting housing.
-Chris