I like to imagine that King has a McDonalds Play-Place that he calls "My Castle"
This is absolutely true and there is no question about it whatsoever. Bless you for this image.
He even has a throne at the very top, and the whole “palace” is super huge, basically takes up his whole floor so you could definitely get lost in it. There’s even smaller pipes and climby things for his little subjects to crawl through and different compartments that can only be reached by the squirrels are full of nuts and things for them to nest in.
King will invite Egos over for Royal Tea Parties which are Alice-in-Wonderland styles of crazy when the Egos are involved and someone always gets shoved off of a high place and Doc has to patch them up.
And whenever King gets sad or scared, he hides deep in the maze of pipes and slides where he feels safest, and one of the others, usually Doc, is designated to go looking for him and comfort him.