Plug the rotary encoder into the Feather with a STEMMA QT cable.

If you want to use the project with a battery, plug in a JST 2-PH extension cable to the Feather JST PH port. This will make plugging and unplugging a battery easier in the enclosure.

Mount the Feather to the lid of the enclosure using M2.5 screws and nuts for the mounting holes on either side of the USB port and M2 screws and nuts for the mounting holes on either side of the ESP32-S3 module.

Secure four M2.5 stand-offs to the mounting holes on the rotary encoder with M2.5 nuts. 

Attach the rotary encoder to the case via the stand-offs with 4 M2.5 screws. The NeoPixel should be lined up with the cutout in the case.

Attach a knob to the rotary encoder and insert the NeoPixel diffuser into the case cutout.

That completes the assembly!