I would put the rabbit cage OVER the worm bins...Raising worms (Vermicomposting) is easy, fun, and gives you an excellence compost in a very short amount of time. If you do get rabbits, you can place a cage or hutch with a wire bottom right under the worm bins. They are several threads about it, too. Here is one, https://www.backyardchickens.com/t/262672/vermicomposting-with-rabbits.