If you have four doors lying around and are in need of a small shed, then this is another viable option. These doors are connected using only hinges and they look pretty good. The patio shown here would make for a great coffee spot, especially with the shade provided overhead. The door on the top also adds stability so you wouldn't have to worry so much about it falling over.
However, you would probably want to place it somewhere that's even, such as on a layer of bricks or on a slab in your yard somewhere. But, besides that, all you need is a screwdriver and some screws.