I am just about done with the "Taj Mahal". It is basically a 2X4 framed, 6'X8' slant roof shed. That's where the similarities to a shed end. I insulated it with Owens-Corning pink rolled R-13, with kraft paper for a vapor barrier. That was covered with masonite wall panels that are smooth and white on the inside (looks like a huge whiteboard). The floor will be covered in a linoleum remnant from Home Cheapo that will be cut so that it goes up the walls a few inches to keep the shavings and poo contained. While I wouldn't go in and clean it with a hose, it will be easy to wash down the walls and floor. I took photos of every phase of construction, and will try to draw up plans and material lists to post for everyone to see. Even if you don't go as nuts as I did, maybe I had some good ideas someone can use.