Here are a couple pictures of one I just built from scratch from some leftover 1/2" OSB from a building project I had laying around for ten years at my cabin up in northern MI. along with a few 2"x2"s I bought. It has 3 drop down glass windows my Dad handmade that are from a 25 year old blind that finally bit the dust. The floor was made from a few 2"x8" boards I had laying around and I bought two 4"x4" treated posts and cut them in half to sit it on because the water table is so high up there I hit water in the first 18" when I was going to put it on those posts a foot or so in the air. To have put it up in the air like you guys are wanting to do would have been fairly simple just by attaching 8' (or longer with proper supports) corner posts inside the 2"x8" floor corners and raise it with a quad or a comealong. I also scrounged a few pieces of steel that were left from a 40'x120' pole building that just went up near me before they went into a dumpster and will use them to cover the whole outside. Several cans of spray paint to camo it when they get put on the next time I go up next month and it should literally last forever. I used screws for the whole project and that's really the best way to go when putting anything like this together.