I like some on martins website. I like The Chinchilla Highrise (FC-430HR) and The Chinchilla Townhouse (PDF-450). I'm wondering if i'd have room for the saucer in those cages. I thought wire wasn't safe for the chins because their food could get stuck in it. With one of these cages would I still be able to put things where I wanted to, like there wooden house. What is the purpose of the drop in/slide out pan?