You must have a real bad self-esteem problem, yr right. Anyone who denigrates the builders of kit aircraft either hasn't built one to know the effort it takes, or suffers from chronic sour grapes.
Oh, and in between rivets on my RV-8, I machined a radial flow compressor impeller for a friend's gas turbine project. Fortunately I didn't have to have CASA to tell me I was competent enough to do it. I just taught myself how it's done and went ahead and did it! Not that I'd call myself a machinist by any stretch.