"Nothing of that period, of this scale, survived"------i think this is incorrect. I remember seeing Marie Antoinette's theater sets in Versailles were perfectly preserved and are currently in perfect working condition.
Nice work indeed, but what was that supposed to mean: "Nothing of this scale from that period has survived"? What about Cesky Krumlov and Drottningholm castle theaters? They are beautiful and very well preserved with authentic stage sets, machinery and props.