These are some step models I created to help design enclosures for anything I use this board in. There are a few things that are inaccurate to the real board. For one the capacitors are the wrong color and there is a diode that exists on the schematic but is not actually present on retail boards.

Dimensions and USB plug position are all based on the official documentation so if you build around this model, a real nano should fit easily.

Since these are STEP files, they should easily import into common CAD programs like Solidworks or Fusion 360. I didn't bother making STLs since I doubt anyone would ever need it. If you do, let me know and I'll add them.