Has anybody ever done this? Ran across this while I was researching setups for meat rabbits... http://ressources.ciheam.org/om/pdf/c08/95605275.pdf It makes lots of sense, seems like it would replicate their natural lifestyle a lot more than wire cages, and take care of the overheating issue in the summer. But how would the poop work? I've read that they tend to go in the same place, is it possible that they'd just know not to soil the "dens"? Seems like in nature, rabbits wouldn't just be pooping all over their underground dens, but as I'm not a rabbit expert, I don't know. Any thoughts? Curious to hear from you rabbit keepers out there.