I have a question...I have my silkies inside my chicken house which is 12' x 30' with brick floors and the runs are 4' x 6' x 6'...So they are big enough to walk and stand in. My question is, can I put a pair of silkies in the rabbit cages you buy from the farm store and stack them? Is it enough room for 2? The size of the rabbit pens are 2'x2'x 18". I would like to put pairs in there but it just doesn't seem like enough room to me. I would like to separate some breeding pairs that way. Thank you in advance for your information!