You are going to need a lot of holes drilled into the back black acrylic panel of the map, holes for screwing on the map cells to their appropriate spot, and holes for routing the LED strip wires and the Capacitive touchpad wire, it way more convenient to model this holes, instead of manually drilling them later.

How you cut the map cells will largely depend on your setup, but the most important thing to keep in mind is that the text is only milled down about 0.1 - 0.2mm, the text itself remains, but the offset contour is milled to expose the text.

Connection Diagram

To be able to record live air quality data from the DesignSpark Environmental Sensor Development Kit (ESDK), you'll need to make it mobile, which involves incorporating a GPS board (A9G GPS/GPRS Board), adding a power bank, and implementing a python script to combine the air quality data from the map with the GPS data from the A9G board, see full instructions for this modification here - https://www.rs-online.com/designspark/the-interactive-air-quality-map-part-2-making-a-mobile-esdk-air-quality-logger