After 6 months of work I´m totally satisfied with the results.
A fully functional Wrist watch with more than one month of battery duration in standby and multiple functions.
Yellow led are hours and the blue led are minutes, it blinks every odd second.
After 10 second without use, the watch goes to sleep.
It has a DS1307 RTC to keep the time and it has many functions: warning lights , flashlight, battery warning and charge state.
All functions controlled with just one touch sensor.
Rechargeable via micro USB
In the manual you can find all its functions.
Full case .stl files attached
The maximum Litio batt I can fit it is 300mha (30x20x8mm) and I didn't install the JST connector I solder it directly.
The project is open source and you are free to edit and build your own.
You can see the video if you like but is in Spanish.