This one is now ready to be sent off to be fabricated. The layout could probably be improved, but its tricky working around the fixed layout for the LEDs so that the boards are able to be daisy chained together.

The big square is for a battery holder for the RTC backup battery

I'll be reusing/re-writing my code from a few years ago, and aiming to have the maths for the geometry of the sun relative to the chosen Long/Lat and time of year. In order to generate a accurate rendition of the pre-dawn and then dawn light, using a generic atmosphere / cloud cover / height for calculating colour and diffusion.