Sensible cat shelving/walkways layout?

[tezster]

Anyone here have any personal experience with putting up cat shelves and walkways? I'm not referring to the elaborate ones you see online (some of them are just crazy), but a more sensible layout I can envision putting up in my own space.

Properly executed, it seems like a good idea in principle to take advantage of unused vertical space: more areas for cats to play, leaving precious floor space free for humans to use

One concern I have is if I ever decide to move and sell my home, will potential buyers think it's weird, possibly driving down the value of my house.