I’ve scanned the topics, but haven’t found any ideas. Has anyone got any ideas for how to mount the electronics (The arduino etc)? It obviously needs to be near enough to the board to connect to the motors and z-index, accessible to connect the USB, and protected from sawdust. Seems like a fun project to work out 
Welcome Maslowian, I think most, with the standard frame, mount it to the back of the spoil sheet.
I have a different frame and needed to take care of the hot climate here, so I mounted the electronics in the airflow of the AC I have on the side. This is not a recommendation, just a perhaps “not how to do it” example 
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Thanks for that example. I probably won’t do exactly the same, but it gives me ideas…