Here is the curved stairway that I set the other day. This is the same stairway that I started a thread on saying how I had made my biggest shop mistake on. Fortunately I caught the error in time. It fit nicely. It took about 8 guys to lift it into place…then I had to hammer drill and anchor 7 inch by 1/2 inch bolts. The turret is solid concrete with 4 inches of foam and drywall on the inside.