The way my outdoor enclosures are set up. As you can see by these pictures, they can go underground, or have plenty of room in the 8ft x 8ft x 6ft cage. As for the way the bottom is made and the burrows are made. The burrows go from the inside of the enclosure to the outside and down at an angle underground. The tubs have a hole cut out of the side of them. There is a tunnel made with hardware cloth and lined with indoor-outdoor carpet. It is attached to the bottom of the enclosure to the wire, and attached to the tub; this keeps them from going anywhere else.
All of my enclosures have wire bottoms except my breeding bins. They then have about 4 inches of topsoil added, then a few inches of cypress mulch, and then topped with a thick layer of fine hay. The first few pictures are without the substrate added.
The top is made with 3/4-inch plywood, and 2x4s used as rafters. The materials needed include:
1) Large Rubbermaid tub with lid.
5) 3/4 inch sheets of Plywood, two of them can be ripped down the middle by the store to make the bottom skirt. The two full sheets can be used as the roof.
5) Landscape timbers or treated 4x4s
20) 2x4s
2 LBS of 8-penny nails
2 LBS of small wire pins/nails/staples
50ft of galvanized wire (chicken wire or hardware cloth).
5 GAL outdoor latex paint
2) strong hinges and 1 good hasp and lock.
10) bags of top soil
10) bags of cypress mulch
2) bales of fine hay



