The one I'll have is pretty similar to the one below, the whole structure is steel and shaped like a house and is big enough to fit a car parked under it. It will be used to keep a tent, small sitting area, and table with BBQ stove under. The pieces fit into each other pretty tightly, with some extra sturdiness from turn screws at the bottom joints. The bases are flat with holes for tent pegs. It already comes with a gray fitted tarp with elastic tie downs.
Good idea? Bad idea? FANTASTIC idea?

Mine differs from this one in that is has horizontal bars along the bottom sides.