it's just a box. pretty basic carpentry. so many ways to put it up and it depends on where you're building it. This cost me a total of $54 for some new pt for the stairs but otherwise it was just material laying around from previous jobs.
4 walls with front wall taller than the other 3 and that makes the roof slope. very simple. getting it up on 4x4 posts or adapting to a tree like this is where it depends on where you're doing it.