This is a anclosure for my GRBL-Trinamic CNC stepper controller. Maybe this is useful for others because it has a mount for a Mega256 Arduino board plus an opening for the USB-Connector and a slot for a 100x95mm sized (cut short Eurocard) PCB with an opening in the top plate for screw terminals.I did draw this in Sketchup, so it should be fairly easy to adapt this enclosure to your project.