I have populated the first board tonight. Thanks to the stencil the whole process was rather fast.

The board in the oven before reflow:

The same board with the trough hole components added and the first blinky test SW successfully flashed.

On the left you can see the Raspberry Pi Zero daughter board installed on its 40 pin connector.

The board is not yet fully tested but all the "vital" functions are OK and no bug has been found so far.