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Looking at the parts than need to be completed, it seems none of it would require more than normal accuracy in the milling process. I think in a few years that we will see much smaller and cheaper CNC machines available, especially for rental in hobby shops. Also, 3D metal printing is becoming more a real possibility. Printed lowers exist, not sure how good they are when build with low end 3D printers.
In any event, please let us know how it works out for you and what issues you find along the way.
As far as the ATF, they might be able to take the gun you built, but can not take the skill that you learned along the way.I agree it would be an interesting project. However, I think that putting together the rest of the gun from selected parts rather than purchase of a completed upper would be more interesting. You do not save any money on the 80% lower, probably you will spend a couple of hundred more by the time you get a working gun. I also question if your completed lower would last as long as a commercial one, hand tools are never going to do as accurate job as a commercial CNC machine.
You might check you local range. NSSF and NRA does some rating of ranges and the classes offered. I know that the local range (ShootSmart, Ft Worth TX) has gone thru several different evaluations from NSSF has been classified as excellent by NSSF. The advantage of a local range is cost and the ability to fold it into your work schedule rather than taking a week go somewhere. A one or two class on the weekend may make more sense.
