What a great up-cycle for an old suitcase especially if it were broken at the hinges already. Support the two sides of the suitcase by 2′ doweling approximately 16 inches long (remember the bottom side of suitcase will “eat” up more of the doweling because it has to go down into that end). Put feet on the bottom side with old baseballs, wooden knobs, doweling or some other creative item. I have even seen these with a bed in one and a place to put away toys in the other but if you are going to do this make sure to give your cat the option to see which one he likes the best and after he decides you can always take the bedding out of the one you want to use for toys.