I built my workshop which is about 13'x24' with stud construction and scissor truss roof framing. Being a metal building contractor, I used metal siding and Butler standing seam roofing with insulation. My wife did not want an "ugly shed" in our beautiful back yard so I made the shop attractive, at least I think so and my wife and visitors love it. The green roof fits in well. Of course as I grow into it an expansion is in my mind….