Just because melting metal existed since 100,000 years ago, or more by civilization. It don't mean you can take a novel usage that combined with ingenuity, can create unlimited scaling, can be automated, reduction of time it takes, therefore man hours in service, cost-effective in its own way. As well as the structural integrity of the structures that is far more stable so can any size be created. My credit falls to myself, my foundations. Do not forget that.