The Curved Staircase #4010 is sized for 10 3/8" from the top of the floor to the top of the next floor.
This slideshow shows how to mark it for cutting to a shorter room
08 With the top step level I can see how much too tall the stair is for this testbox (or for a house this size)
08D.png
11 A stack of paper is adjustable to exactly match the height when the step is level
11D.png
20 it lines up at the top of the bottom step - that's lucky but not required for success
20D.png
