The lines on this inserted staircase look really pretty - maybe we should have the first step situated forward of the inset area in the wall. That would also raise the height of the first step protruding from the stairwell area wall, right?
This looks cool...it switches which center post the treads are centered on halfway up the front post.
Smooth framing the lower edges seems safer forehead hits.
I like that this apron keeps the open/airy feel because of the cutouts. As essentially an all metal spiral staircase (barring treads), I quite like the lines of this one.