I know at this point you're saying "we have no money to do this" but hear me out.
A very large version of these can be created as a "group" room - even attached to a fenced (around and above) outdoor play area.
So make friends at construction sites to get free "leftovers", ask your local boy/girl scout troop to volunteer some materials and or time for building, and the payoff will be healthier, happier, highly adoptable kittens and cats!
In the age of No Kill, cats may spend a longer amount of time in a shelter, giving them time - especially the older or special needs ones - to find a forever home.
My Garth spent over 7 months in a short cage with his small bed, water/food bowl all up against his tiny litter pan, resulting in his food, water, and/or bed having dirty litter in it and no room to play with his toys - there was just enough space for him to stand up and turn around and that was it. He was depressed, and so tended to huddle and was ignored and passed over when people came to adopt. I don't blame him - I don't know about you, but I don't generally like to eat next to my toilet..........
This is not uncommon, especially at Municipal Shelters, but many private shelters are similar. Their reasoning is the cat won't be there long but this is faulty logic, especially in No Kill municipalities. Also, having a cat in an environment like this often causes it to be sad and withdrawn, which lowers adoption speed and rates.
Clean cages and playing kitties = higher adoption rates. It's a statistical fact. And good adoption rates = more places willing to become No Kill.
My Sabrina was in a shelter for almost 2 years (special needs) but she had this environment.