There is argument that it's easier to build car now than in 60ies because car parts manufacturing was decentralized in 90ies. In 60ies vertically integrated car companies dominated market and you could not buy car parts at any price if those companies did not want to sell them to you. Now most parts are produced by third parties (that often used to be part of fully integrated car company like Delphi Technologies) and you can build modern car like legos, outsource pretty much everything and only do final assembly. Still not easy (30k+ parts in every car) but doable.