I printed the lower section of the case, so it was time to fit the Nano to the PCB and put the PCB loosely in place so I could connect up the USB cable and see what happened. The good news is that it all lit up as it should and the LED that should flash did indeed do so.
I think it’s now time to start fitting all the bits and pieces that will go into the base (fan, USB socket, power socket, humidity sensor).