Check out the sbs website. They have some pre fab kits for shop building.I am not sure if any of them meet any of your specs. But, I have a buddy that just built one of there kits for a shop with a little woodstove and its pretty sweet. There are alot of companies down south that offer steel building kits at approx your specs. May have to drive down and pick it up though. I have been looking in Alaska and have not seen any. Might be a good bizz to be in...
