( This is 13,000 times the world's gross domestic product (GDP), and that's just to supply the steel; labour and other construction costs would send the costs even higher. Oh and if that weren't enough, it would take more than 833,315 years at current production levels to supply enough steel for the 87 mile diameter space craft. So, if you were hoping to achieve universal dominance any time soon, think again. Somehow this actually reassures me.)