We finished the last piece of the cat path I posted about earlier! This one goes from the laundry room, to the stairwell, and then into the guest bedroom on the upper floor (yes, I know the carpet needs replaced in that closet). They are already using them and seem to love the new path already.
That's awesome, but I was very confused by the first picture. I thought you ran ducts all through your house like a giant hamster cage. Very cool though!
He is a Pomeranian/husky mix. We just adopted him and his sister about a month ago, and our least confident, but largest cat needed a confidence boost. We gave it to him in the form of putting holes in the walls
Just a heads up: cats get a confidence boost from how stuff smells.
Even when neutered at an early age, they have a highly sensitive nose, plus a vomeronasal organ, they keep rubbing their smell and saliva onto everything, and are highly territorial regarding anything smelling "not right".
If you plan on having more than one cat, also plan on sticking to a strict cleaning policy to reduce odors and keep the ones left as uniform as possible, before the cats "fix" it for you.
Personally, I'd be wary of a carpeted floor, any carpet-like surfaces, or letting cats get into high places that can turn into waterfalls or allow them to piss on the ceiling... and I seriously wish that was hyperbole.
(Source: lived with dozens of cats, the remaining 5, both males and females, can still get into a pissing and puking contest when some chunk of floor, furniture, clothes, or whatever, "smells wrong")
They can be kinda loud when they are playing on the ones in the hallway, but that wall is the other side of our closet, so it is mostly muffled thumps. Not enough to keep us awake or wake us up, but loud enough that you can hear when you are awake