Using an old, wire dog kennel, we removed the bottom of it (the tray that lays in the bottom as well as the wire underneath). This gives the rabbits unobstructed access to the grass below. They get to work eating and you… well, you can go do something else for a while! Just be sure to provide them with shade. And it’s easy to attach a rabbit waterer to the side of this cage for hot days when bunnies need more water than found in grass and weeds.
In addition to using a dog cage, once the rabbits are big enough, you can separate them by sex and enclose them a small area using electric fencing. We currently house our bucks in the dog cages, while our does are inside electric poultry netting. Just be sure to provide the bunnies with some sort of housing or protection from the sun and any rain that may come. We found an old dog kennel and took it apart. It separates into two pieces. We just use each piece as a shelter for the rabbits.