I suspect maybe it was just my google-foo letting me down, but there were some truly useless library files out there on the interwebs for the Nano, whereas there were some great libraries including 3D models for some of the other models of the Arduino. Go figure.
You can find the files on github:
Pop a comment down below if you find them useful, I create a lot of custom library files for Kicad but most of them are pretty specific to what I need and never see the light of day. I thought these ones were a bit more applicable for others to find useful.