Paul Allen's Vulcan crew found the Japanese carriers Kaga and Akagi sunk during the Battle of Midway. Cool stuff!
https://www.nytimes.com/2019/10/21/us/battle-of-midway-carriers-ww2.html?searchResultPosition=1
I think you are only seeing the bottom half of the window - or else it's an attic room with a low ceiling at the wall. Cinder blocks make excellent speaker stands.
Some Japanese DIYers reported LT4320 didn't work properly with center tapped transformer configuration.
I suppose that LT4320 can be used in only dual secondaries configuration.
Wow I haven't seen anyone owning two pairs of them before.Wiring them two speaker per channel makes them comparable with floor standing electrostatic panels. There was an offical accessory called JS-2 , a speaker stand for esta-4u. Although I couldn't find one for sale but I diyed one.
Interesting article on why from a (software) engineering / management perspective, why things may be the way they are ...
https://tidbits.com/2019/10/21/six-reasons-why-ios-13-and-catalina-are-so-buggy/