I know. It's pure genius. Reminds me of when I building wireless remote temp and weather monitors overseas in the desert using Arduino-based micro-controllers. Each iteration kept getting smaller and smaller as I learned more and more. Even built a couple of mag-mount GPRS/GPS trackers in some Altoids tins so we could track down bedouin who would steal our equipment. Can't wait to see the finished product - hopefully it's fairly small.