Holes were drilled in 2×8 lumber and placed on the boom. Wood spacers are separating each step support. The boom is the center of the circle.
You can see additional spacers holding the steps apart; further away from the center. Once we are done building, you’ll see that the steps protrude out of the castle tower. These were latter changed to a 2×10 stringer.
We stacked the treads and inserted the pipe through a hole in both the top and bottom platforms. After the pipe was guided down to the floor, we placed spacers near the pipe in between each tread.
We’ve installed a stringer to support the treads near the middle of the treads
Curved Plywood! Yup, curved… We made this ourselves. Several 9″ wide strips of 1/8″ plywood are glued & screwed together in the shape needed. Once the glue dries, the curve is very strong.
Jeff & Christina test our stairs. You can see the clamps that held the plywood together while the glue dried.