I just tried to make a nesting box for my cat. But, I was wondering if it has to be newspaper? Can it be cut up strips of foam rubber in there? It is the stuff you use as an egg crate matteres the stuff you would put on your bed. This is my first time doing this so I am a little uneasy about all of this. How long in adavnce do I need to make the box? If anyone can help me it would be greatly appretiated.....