This revision I decided to try PCB headers to modularise the design. Particularly with the DC barrel jack, it would be much easier to mount the connectors with header pins but they just don't fit the case:

The last build I soldered the pots the wrong way around, so I'll have to think carefully about which headers to remove to keep flexibility, but also to fit it in the darn case. The audio jacks are easy to get right, as is the diode. The potentiometers and the DC barrel jack will probably stay on headers.