The Grail Company is scary powerful. Like, in days they managed to mobilize enough artisans to make something really custom, made exactly to Yuuki's specifications (which will turn out to be quite ... esoteric).
A company founded on a single purpose to provide economic might to support the reincarnation their Lord, managed by people driven by utmost love of their protector, motored by geniuses from a village with 100% literacy ... so powerful that the slogan should be "Kingdoms may rise and fall, but the Grail Company shall stand tall."