>>2007656https://www.youtube.com/watch?v=g0QjhGr73Nsyou may enjoy this film about bicycles, if you can stomach the droll british commentary.
It shows some of the framebuilding process, and the process for drawing steel tubing at the columbus factory.
Framebuilding is incredibly skilled work, far beyond assembling a bicycle from parts. It also requires a number of expensive specialty tools.