The PCBs have finally arrived today, so I was excited to start soldering. Fitting to the epic series of unlucky events I am experiencing recently, I have received 6.2k Ohm resistors instead of 390 Ohm ones. Patience is a virtue...

Update - I soldered together what I could and I am very happy that it works. The LEDs powered by 5mA are a little too bright. I need to start tweaking the resistor values.