Outhouses were easy to build. They were nothing more than a wooden shell with a roof, a floor and a front door. Inside was a 2 foot high box built into the back half that went from one side wall to the other side and came out from the back wall about two feet. In the top of this was an oblong hole about 12 inches by 10 inches. The outhouse was set over a hole that had been dug, usually about 5 feet down into the ground.
Some outhouses really hang in there.
This old outhouse sitting on the Alberta plains is the only structure remaining on this old homestead. It seems kind of lonely all by itself. What the inside of the above outhouse looks like. I often get requests for outhouse blueprints. The above picture is about as good as it gets.