My grandpa made our rabbits cages, He made a "house" type thing for them, with window. He made it with a lot of really thick wood, and he but insulation inbetween the wood (so the rabbits couldnt get at it) he put a LOT of insulation in there, because rabbits can easily die, if they are not warm enough. You need to put something in it too, like straw or sawdust witch you can buy at Tom's Town and Country or the Country Store in town here. But you need to be sure it gets cleaned out VERY often, because rabbits can get very sick if they are laying in there own "discharge" I would suggest litterbox training it, mine were completly litterboxed trained and it works wonders to save a lot of time cleaning there whole house out, letting it air out, and disinfecting it. Hope this helps! If you have anymore questions, feel free to pm me, I know there are a lot of rabbit owners on here, hope they can give you some suggestions too!