Most rabbits are raised in hutches that have 1/2" x 1/2" or 1/2" x 1" galvanized wire mesh bottoms. This will allow their droppings to fall through. If they stay on any other type of surface that allows their feces to accumulate, it will cause disease because of the bacterial and possible parasitic build up. It is usually best to surround the rabbit with wire or metal because the rabbit will chew threw wood or plastic that they can get at. Be sure to protect the rabbit from the sun, wind, rain, and extremely hot or cold temperatures. Use an automatic feeder that can be filled without opening the cage. Also, I like to use water bottles with metal tubes.
When buying or making rabbit cages allow 0.75 square feet of space for each pound of adult weight. For instance, if a rabbit's adult weight is 10 pounds, multiply 0.75 by 10. This gives 7.5 sq ft. This can be attained by building a cage 3 ft x 2.5 ft (3 x 2.5 = 7.5). The height should be 18 inches. If the adult's weight is 3 pounds, multiply 0.75 by 3. This gives 2.25 sq ft. You can build the cage 1.5 ft x 1.5 ft (18" x 18"). Its height, because it is a small rabbit, can be 15".
Never make the hutch more than 3 ft deep or the sides more than 3 feet from your grasp. Otherwise, you'll have trouble getting the rabbit out when you need to.
Do not put rabbits together after they are 3 months of age. The ones of the same sex are territorial and will fight. The ones of opposite sex will breed.