Step 1: Cut Up the Parts
I started with a treated 2-2x8x8'. 2- cuts on the table saw of 2" for the base frame. 6- cuts at 3/4" for the sides and top frames(Or you could use 1x2).
Step 2: Glue Up the Panels
I used a biscuit joiner and #10 biscuits.
Step 3: Add Wire and Plywood
1/2" hardware cloth(1/2"x1/2" spaced wire). 1/2" Staples with air gun. 3/8 plywood. (About 1/2 sheet)
Step 4: Screw the Panels Together
Drill pilot holes through rails to prevent splitting. 3" screws down into base and 2" to connect at the corners.
Step 5: And There You Have It!
Add a door(this was a scrap of 1" wood panel). Hinges on the front to allow access and cleaning. I added a 40w light bulb for some heat. These ones were only 3-4 week old and it gets cold at night.