in addition to basic setup of your wifi, add the python script (to be linked somewhere later) to the pi and use pip to install the flux_led library. Modify rc.local to run the script on boot. Make sure you add an ampersand to run it in a forked process.

solder the switches with connections to pin headers or direct wiring to the pi GPIO pins. Make a cable for power to the pi.

yep. I'll put them on thingiverse once I know it works. 

Slide the buttons in place.  Attach the pi using standoffs. Cut the prototype board to fit and slide into place. Glue the power supply in. Attach cables between the parts as needed. 

Remove the old switch and twist the switched wires together. Connect the power supply to the correct wires with wire nuts and screw the faceplate in