Hi Stacy,
The mention of the Raspberry Pi interlock was for testing and also as an example of the way you could add your own interlock implementation.
Most facilities are using ProXR/NCD interlocks or Modbus enabled interlocks (mostly by ControlByWeb)
ControlByWeb relays have the advantage that some of their devices can be used both for interlocking equipment and for temperature/humidity sensors, and are supported out of the box in NEMO.
The Jumbotron's theme is not editable, only the background image is customizable.
Let me know if you have any other questions!
Thanks,
Mathieu