Starting with the battery life, the watch has now been running since August 7. In a previous project log I showed that the calculated run-time would be up to 6 months, which has been achieved now. The voltage has dropped to about 2.8 V, so it might last for a couple more weeks.

Additionally the source code is now online on GitHub: https://github.com/CoretechR/Chronio

As the pcb and 3d printing files have already been released, there is nothing more you need if you want to build your own copy of the watch.