How important is it to have the 6 or so inches of plastic on the sides of a C&C cage? I'm in the process of building my cage before I get my guinea pigs, and I found some stuff at a recycle store that is not Coroplast. It is much thicker and not as flexible, and I was only able to find enough to put on the floor of the cage. I have a fleece blanket and I thought maybe I could pull up the sides of that to the proper height and tie it to the cage to prevent the pigs from chewing on the metal bars. Will this be ok, or should I look for something else to put along the sides of the cage?