I found out about C&C cages after I had my boys for a few weeks. I didn't want to get rid of the store bought cage because it was so expensive, but I knew it wasn't big enough for the two of them as they started to get bigger. This is roughly my 5th design of my "hybrid" cage. I used an old rubbermaid container for the "kitchen". They like to play in the hay, so this helps keep it from flying all over my small apartment. The upper level functions as their napping room and they like to lounge on the "porch" (which was the original upper tier in the store bought cage). I put a vinyl picnic tablecloth on the back of my couch to protect it. I found rubber foam type tiles to put under the coroplast between it and the carpet.