I recently decided that I'm going to give raising rabbits a try. I've raised chickens and enjoyed free-range chickens so much that I decided against using cages for rabbits.
I'm going to be fencing off a pasture for them and supplementing them with additional food as needed.
So far I have two shells made up and will be working on more once I get some more barrels. The barrels and entry pipes will be covered with soil which will be packed down and seeded to keep it in place. I'm still working on a removable top that I'll be happy with. The idea is for the top to hold around 8 inches of soil so the den will still be insulated but will allow me easy access for checking on kits, etc.
I'll try and take some more pictures tomorrow.