Each cat has it's own separate area with cat tree, cat wheel, litter box, food, and fountain (or bowl if they swim in fountain ;) They also have access to an enclosed outdoor area. We still have some work to do to finish the outdoor enclosure and add more vertical height to indoor enclosures, but it's all a work in progress. We usually let the male outside when we're home and the locked up female, Friggy, gets roam the house supervised with Freyja, who is free roamed in the house all day. Than we rotate so the females can go outside and the male can roam the house. Kittens are born in an area set up in our bedroom and moved to pen in the living room to explore and play once they hit 4 weeks of age.
Our cat room
Freyja and Óðr play outside in new enclosure for the first time with Ollie there to welcome them and keep all the predators away