Finally an update to my previous postings.
I have started constructing my clock after shelving the project for two years.
I have gone the way of modular design. What that means is, that the most important items are in modular form, or compartmentalised. Basically, every section is on its own board.
I have made a simple voltage regulator for 5v (LDO).
I have made the timing circuit on a separate board, the display, on its own board, the logic on its own.
The buttons on their own board with their own MC14490 ic too.
As for the boards I used, I will mention at a latter time, since I am expecting confirmation from the manufacturer to get the OK to mention their name.
In the mean time, enjoy some early photo's. These will be published shortly.