As to the "uncommon resources" part- what percent of the people that you know have two steel tubes of the right diameter? I didn't say it was like securing refined plutonium for an A-bomb, but I stand by my statement that those resources are not common possessions.

As to the time part - yes, absolutely, it does. Just because you've got craft skills does not mean they are common. Do most people who own a home defense gun build them themselves using common parts from a hardware store? In fact, I bet that's extremely rare.

I didn't say they were super hard, and I didn't say the resources were super rare. They're not out of reach of any dedicated person who is intent on achieving a goal. But then, a speed bump doesn't force you to drive slower, either. You can sail over them at 90 miles an hour, once. But speed bumps still do their job.