And here is the backside of the clock. As you can see, I took a few days wiring up all the LED on the front. It was a bit tedious, but also fun to see the result. I tested each line I added separately with a test program, to make sure everything worked well before continuing.

The wire used is actually wirewrap wire. It is very thin, and therefore has a higher resistance, but if you keep them relatively short this will not affect the circuit. They place themselves easily, but unfortunately will break if you move them too often. Easiest is to cut them to the correct length first, then strip them with pliers, then solder two spots together on the board and then push the end into the existing solder. This way you get a pretty solid connection to anywhere.