Depends heavily on your definition of "build yourself"... The airplane is a big one and I'm building one myself in my garage, as did the inventors of the first

Depends heavily on your definition of "build yourself"... The airplane is a big one and I'm building one myself in my garage, as did the inventors of the first airplane. Hell, a solid chunk of all other inventions were created in someones garage. Compared to a full scale airplane, making nuclear reactors or transistors yourself is even easier and the transistor is easily the single biggest invention of the past century.