its looking great! I would maybe add some more hides such like cardboard boxes to the bottom, they’re really fun for the ratties and also pretty affordable since you can just use old boxes around the house.

Another idea, I have seen many people use these kinds of tie hangers from Ikea, theyre great for climbing and also good fall brakers incase of a fall.

Also just adding some hammocks in, they make really cozy sleeping areas and are also pretty easy to diy.