Selecta - build guide
First cut all the traces located in the red circles. Make sure you have no continuity or shorts to ground.
Now you can solder the components as shown in the image, take care not to cover the hole for the thonkiccon pin, so the jack won't push the resistor when placing it.
Once the PCB is populated you can place the jacks. The switches have 2 nuts, put one of them in every switch before placing the panel (the panel placement has 2 options, depending if you like switches on the left or right side), and after place the second nuts.
Soldering the jacks and switches with the panel and all nuts will avoid mechanical stress to the PCB.