Summary

This is a remix from the excellent worked done by mcseven (https://www.thingiverse.com/thing:1680291).

I have added PCB pins to the box so that I can hold my PCB in place.
Also, I have added engraving for the purpose of the box (in my case 'Relay Box') to be printed on the top of the box as well as on the lid.

Tweaked a few of the OpenSCad Customizer options.

Basically, playing about with a great tool and making something useful in the process.