I did most of the soldering today. I failed at ground plane while designing the PCB, GND pin of: ISCP, 3.3V LDO and status LED were not connected. I thought DRU provided by fab house would check that, my bad.

Another problem I found 3 days after placing the order is that transistors used for turning on water pump and laser pointer are not connected to the ground. 

So, 5 jumpers, I should probably stop calling this a 'final version'.

Using Arudino Uno I uploaded bootloader to new device. After uploading sketch I briefly tested bluetooth connectivity, controlling servos and switching on water pump, so far no problems.

Next step: fitting stuff back into box.