Azuchi 7th Floor

Ota Gyuichi does have some written material on Azuchi Castle.  The Azuchi Castle Museum does have a replica of the 6th and 7th floors.

Chronicle of Lord Nobunaga, p. 257.

"The seventh, top story is 3 ken [6.36m] square.  Inside the room all is gold.  The outside, too, is gold.  On the inside pillars to the four sides dragons ascend and descend; on the ceiling are angels in their earthly manifestations.  Inside the room are portrayed the Three Emperors and Five Sovereigns, the Ten Accomplished Disciples of Confucius, the Four Wise Men of Shang Shan, and the Seven Sages of the Bamboo Grove.  The number of angle braces and their pendent wind bells is 12.

The aperture shutters are of iron.  There are more than sixty of them, and they are all lacquered black.  The outside and inside pillars of the sitting rooms are generally varnished with black lacquer applied on linen and the top of that lacquered black."

Tenka no tame!