This is a cheap magnetic chalk board from an online vendor. I had to make the frame a bit thicker with 20x20mm wood blocks to fit the electronics.
A Raspberry Pi 400 with a USB3 SSD is glued with double sided tape to the back. I installed the standard Raspian and added IOBroker to it (https://www.iobroker.net).
In IOBroker I installed the adapters for my home automation appliances (Sonos, Sonoff + Shelly power plugs, Harmony remote, etc.) - there's an adapter for almost anything that has a WiFi connection.
I also added Node-Red (https://github.com/node-red/node-red) as an IOBroker plugin with the Raspberry-GPIO nodes.
The switches, meters and the rotary dial are gathered from eBay, friends & family, etc.
The switches are connected to GND and a GPIO with pull-up enabled. The ampere meters are also connected to GND and a GPIO with a resistor in line and PWM output enabled in Node-Red.