What height do you prefer your coroplast "walls" to be and why? I have seen everything ranging from two inches to six inches and even twelve inches for "back" walls. I will be using fleece for most of the cage and possibly litter for the kitchen. Im about to take the big step of cutting the coroplast and Im afraid I will change my mind and want something different as soon as the cut is made. . Lol . . So scary! Feel free to add pictures if you want so I can see the various options