Is there a G120 pcb footprint file laying around here?
Yes, in the Cobra files
Under the CobraIII’s resources section?
If anyone else is looking for Altium Designer versions, you can download them here.
http://www.axoninstruments.biz/download/GHIElectronics.zip
Includes the G120, G120HDR, G400-D, G400-S, Cobra2, Gadgeteer sockets, cellular modem, G30 (not checked 100% yet) and WiFi-RS9110
Free for any use but if commercial, please mention my name in your documentation 
As usual, you are free to use but I can not be held responsible for errors or omissions. You are the final judge in the use of these and should triple check your design before committing to manufacture. I’ve used almost off the parts (except the G30) so I know they work but please check before you use them.
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Thanks much Dave. So attribution in the appendix of the documentation. I suppose I can also put stuff in the forward 
Yip, anywhere is fine.