Alfie and Bubbles's Aviary
Click photos to enlarge
The shed section is 4ft x 4ft, and the run is 8ft x 4ft, giving 12ft x 4ft total floor space.
The aviary is 6ft tall at the front, sloping to 5.5ft at the back, so no bumping your head on the ceiling when you walk in unlike with the dog kennels that are around 5ft.
A clear tarpaulin across the front keeps the rain/wind out in colder weather and guttering along the back (leading into a water butt) stops the rain from coming in under the back wall.