Nice project, thanks for posting it. I've always been interested in hardware noise generators and their applications in 'true' random number generators. There is tons of stuff on the web but many are either too complex or expensive to experiment with or if simple don't do a good job of 'quantifying' their ability to generate 'good' random number distribution. I will attempt to keep up with your progress if you post an update here once in a while.
Lefty