I made a simple docking station for my hopper:
http://imgur.com/a/hqj0b
All you need is a hopper charger v2, a piece of wood, a 6mm/14mm drill and a sharp knife. The charger ring should stand out a bit, so the hopper can be tilted forwards. I stuck the docking station to my desk with some Blu Tack, so it won't wobble when docking the hopper. A bigger one that I also made doesn't need to be stuck on the desk, but I prefer the smaller one.
I used an external charger before but I was really annoyed of switching batteries all the time. Now I just dock my hopper after each bowl, so it's always fully charged and ready for take-off. It feels really awesome how the hopper connects to the station.
@Ratchett Maybe you can make a nice docking station based on this.
Btw, I absolutely love my hopper. It hits so damn hard...