I had a few realizations hit me after I finished the cage.

The cage needs more doors. I will need to add a door on the first shelf on the bottom left, and on the middle shelf, probably under the third shelf.

The kittens like to push their bowls off the shelves. I will need to add a piece of trim to the edge of each shelf to make a lip that he bowls will be harder to get over. This will require that I cut away some of the tile to make room.