-- UPDATE THREE--
Guys, I couldn't help it. I had to continue working and now the clock is near to its final state.
I'm lacking 5 m-f-jumper wires but I already ordered some and they are expected to ship on Thursday.
While waiting I completely assembled the rest of the clock's circuitry and added the lines to get row 3 to work.
Here's an image of the clock:
When everything is finished on Thursday I'll post the complete source code as well. I am always open for suggestions on code-improvement and other stuff.
See you then!