I hate to do this but with moving to SE AZ soon I have to rent a place for awhile. The landlord said I can put up a shed but I cannot pour a concrete floor or put up anything permanent. Would there be any problem with this? I can buid the floor extra hevy if i have to, like 2x12's on 12" centers and 1 1/8" T&G plywood if I have to. Won't be anything big, maybe like 12' x20'.