Since the pcb in the meantime contains quite a number of smd parts, soldering by hand became increasingly tedious. So, I changed the placement of the components so that most of the smd's are on the bottom. And took the opportunity to build a poor man's reflow oven using the approach from here: https://github.com/apollo-ng/picoReflow, something I always wanted to try.

Below you see the results, works nicely with an used oven and a bit of tinkering. And, now I can reflow solder also smaller components and those that cannot be soldered by hand - I have a few ideas for what I can use that for in the future.

Before reflow soldering

After reflow soldering