If you are comparing building a Ford automobile to a billion dollar drilling rig, I’ll step back and let you have that one. There are a finite number of drilling rigs on this planet, and they can’t be built in a matter of months.
Never heard of an Assembly line, you know interchangeable parts and etc, The great part of this country if there is a demand someone will be rushing to fill the order.
I think that many are built in Korean shipyards