What would the cost be if an Illuminati-type figure arose out of nowhere -- and commissioned a gigantic Gothic Cathedral be built out of pure gold (see details)

Its just a surreal, fanciful question that came to mind when I was studying Gothic cathedrals—mostly looking at the Ulm Minster Cathedral (Lutheran) and Cologne Cathedral (Roman Catholic) in Germany.

Suppose an Illuminati-type figure and perhaps conspiracy theorist arose out of obscurity and commissions a huge Gothic cathedral be built somewhere in the middle of a great city. Doesn’t matter where.

It resembles the two great Cathedrals of Germany, mentioned above, or St. John the Divine in NYC or something similar—you know, Gothic—unbelievably intricate and fanciful and surrealistically beautiful.

This Cathedral is on an even larger scale, however—maybe the towers reaching around 800 feet.

“Please. Can’t you make it pure gold?” he begs, in a genteel demeanor. But there is not enough gold in the world, he is told, as it is true that all the gold in the world is only 1/8 the size of the Washington Monument.

Nonetheless, the Cathedral is at least plated inside and out in pure Gold, not his whole wish, but about a dozen times the amount of gold that he was told exists in the world.

Miraculously, also, the edifice is built in less than four years. Also impossible. But what if?

What would official reports of the cost be?