I probably have some pictures of it, but it would be difficult to find them.

That said, the batteries are at the hub and rotate with the wheel -- everything rotates with the wheel. Being almost at the center of the wheel, centrifugal force is not a big problem, and neither is throwing the wheel off balance. Then there's wires wrapped around the spokes that go out to the four spoke lights he normally uses. As for water proofness, I don't know -- but it wouldn't be hard to make it waterproof, and really, if a little water did get into the battery pack, all it would do is cause rust.