Warning: You won't be able to access the Micro USB port with this enclosure!
I modified this housing to be quite a bit slimmer, but it still has enough space for a level shifter and a 24V to 5V step down module. That's why the opening for the wires is so small: The plug goes straight into my LED strip that already has 24V from the main PSU.
The top is a press fit. There's some wiggle room so you can certainly double the amount of wires and stuff inside the case.
The author remixed this model.
Lowered overall height, changed size of wire hole, removed hole in lid