anyone ever try to make a rotessire out of two engine stands?

right, i plan to cut the uprights and insert square stock into them, and reweld them. also plan to add side to side supports. i was just wondering if you guys think the pot metal like wheels will hold up even if used on concrete. also, i am not worried about turning the car completly over, as all metal work and all metal is bare under the car, from all the new metal that was installed by previous owner. i really want to flip it enough to do the seam sealing and i want to paint the underneath body color and then and only then apply undercoating

If the concrete was real smooth I would think the wheels would hold up. Is there 4 wheels per stand?