The shed is to be suspended on posts with a crawl space below? You won't get approval for a wood stove in there not to mention the size of the space....you will cook in there like an Easter ham! 5/8 inch plywood for the floor will not adequately support any wood stove of size not to mention you will require some protection for it like brick or sheetmetal on the floors and walls below and behind the stove and the stove is required to sit 3 feet from the wall. My garage is twice the size you are planning and I wish I had more space.
