sadly I made an mistake while designing the PCBs. There is a missing wire:

But this does only affect the RX, TX and Power LED so if you are not using any of these LEDs you do not have to worry. The PCBs do work without any modification. If you need the LEDs get a screwdriver and a soldering iron and fix it like this:

So I did fix it on both boards I soldered so far. It is not difficult. Tomorrow I will post pictures of the finished board in their nice acrylic cases. They do look good.