Here is the new prototype. The box found a new home in the PiModules acrylic case.

The PiModules UPiS advanced battery board works very well, and I solved the overheat issue with a custom top plate, leaving enough room for heat to dissipate.

Unfortunately, the UPiS for Raspberry Pi B+ is not out yet, so I had to go back to the original Raspberry Pi B. The new UPiS may be released during this month, so hopefully the next prototype will be ready for the next contest stage.