I think I'd rather start with a manuel machine than a CNC machine. That way I can spend more money on tooling.
So what about starting with a mini-mill and a small lathe? Those will handle small parts like triggers, bolts, grip panels, Timmy rams, grips, etc, correct? What about bodies, could I mill something as large as say a er body on a mini-mill? I have plenty of ideas for small parts, such as grip panels or drops, but not so much a whole gun.