i have 2 indoor rabbits one is about the size of mini-lops, one is probably a bit bigger than them. I have them in a 48" dog crate and have also attached a puppy playpen onto the crate to give them extra space to run about in while im at work. If they are not going to spend much time in the crate then you may be able to get away with a 42" dog crate but my opinion is get the biggest one u have space for :wink: There is a link in the rabbit care reference section about how to add a shelf to a dog crate.
By the way.. i got my dog crate from ebay