Download PCB gerbers from here, and order from a PCB fab such as OSHPark.

Assemble board with transistors, resistors, Digistump Oak, LEDs, and potentiometers.

Plug in Digistump Oak, power on, connect to Particle Cloud

Create two MQTT accounts or streams, on a website such as data.sparkfun.com. One stream should correspond to each KiT device. For example, for communication from Alice and Bob, Alice's KiT should be set to read from Bob's stream and publish to Alice's stream.

Configure KiT firmware to read from the partner's stream and publish to your personal stream. Then program the ESP8266 (Digistump Oak) hardware with this hardcoded firmware. The KiT firmware should also be hardcoded with your WiFi network and password (I'm working to improve this process, but it's this way now for simplicity).

Test that all hardware is working as expected by trying to push updates. You should be able to choose a color with the knobs, push the button, and then see that color reflected on the partner device.