Thanks all.
That is the second best Samurai modeled castle I've ever seen (no slight, the best was truly eye-popping)
Yes it is truly nice (I can say this because it's not mine). It has been attacked and conquered in a few games.
Also there has been diplomacy and negociations inside also, all inside rooms are decorated too.
Once a player character was kept prisoner in the lower basement for some time.
And once a player character who had won a battle and took the castle was asked by the GM at the end of the (apparently finished) game: OK, you've won the day, what will you do in the night? The player answered: I put guards all around and I sleep on the highest floor (and he did put figures where he said). The GM answered: Right. But you do not awake in the morning ...another player, a female player, in the role of a ninja chief, had not escaped with the defeated troops but secretly said she was hiding in the upper roof; the victorious lord did not say he would check the roof; she rolled a die succesfuly to kill him during the night.
Details of its building (text in French but with many pictures):
http://euthanasor-wargamesetmodelisme.blogspot.com/2020/02/la-fabrication-de-mon-chateau-japonais.html