I want to share my experience.
I made a "cat's corner" myself. It includes an isolator house, place for games, a vertical labyrinth and also comfortable table for care and taking pictures.
It's a good thing when you have everything at the same place.
The cats also feel more confident on their territory.
It's comfortable to keep a mother-cat with its kittens in a separate house.So they learn to use a toilet. And you are not afraid to step upon a tiny kitten.And if a mother-cat or any cat is aggressive, you have the opportunity to isolate it.
In order to take a hidden cat out of labyrinth, there are special doors on the right side of the constrution.
It is recommended! If it's possible make something alike.