Screened and Sheltered, 13 x 25 x 9 ft, Pole Frame, Gable Roof, Concrete Floor. PDF number 6022. Find the plans at NDSU.
Not a woodworking project but worth mentioning. Build the unit to a height that is easy to work on, and finish the installation with a terraced work-space. This free garden plans and woodworkers projects information is courtesy of Garrys BBQ Pit.