If I had this to do over again I would have painted my outter 2x4s before I added the wire so it would be at least somewhat sealed from the weather. You may be ale to tell that the roof overhangs the edges by a couple of inches in an attempt to protect it a little, but more would have been better.
Materials used: 5 pressure-treated 2x4x8s
18 or 19 regular 2x4x8s
4 sheets 1/2 inch plywood
a 10-foot piece of pre-formed flashing
2-25ft rolls of 2' wide hardware cloth, 1/2" x 1/2"
One set of hinges and a latch for the door
1/2 gallon of paint
Cost: about $220