Looks very interesting, will definitely try to play around with this if I find a free minute at some point.

One thing that struck my eye is your use of github repositories which I am not fully understanding. Is there a specific reason for having each major and minor version of the OS as a separate git repository with only a single real commit, and each iso download as another separate git repository?

In my mind it seems so antithetical to tracing the development history that right now I am scratching my head at it a little.