What cat wouldn't love this. Another thought... If the wire exterior unit was made of something rain resistant like downward facing shutters (recycled of course), then you could have the cat box literally outside of the house. It would only have to be half as tall as this, but would still need a cat door as well as a maintenance door.
Awesome Cleaning Slime am 1 tablespoons of white (Elmers) glue. Add about 1 spoon full of water. Mix. Then in another cup put 2 tablespoons of borax and 2 tablespoons of water. Pour the glue solution and the borax solution together and you get slime. Add some food color to the glue first if you want a cool color.