Alright - I think that is as good as I am going to get it. Here is the motor driver box:
I couldn’t do anything about the USB poking out the side hole. It isn’t super bad. You can see that more clearly here:
I shifted the one driver board from the previous attempt to make a little more room as well - so here it is with all three drivers, the nano, and the USB cable:
I still have some more cabling to go - but everything else should now fit. I will clean up the OpenSCAD file (I did some of it as a pretty crude hack just to see if it would work) and will then do a merge request. I will mention that the nano support is fragile. I haven’t had one break with initial insertion when I was careful. I have had the post on the USB side break off if I tried to insert and remove the nano a couple of times…