I just completed five brazilian cherry stairways that went into a real nice home. Three of these were stacked above each other and had raised panel bellies that I had to also make. They were just basic straight stairs..but 92 treads in all.
The wall rails had up easings. over easings..and quarter turns back to the wall.
The top stairway to the fourth level had windows adorning the right side of the stairway. All the stairways are completely walk under with raised panels on each of their bellies.
I used four 18 inch microlams that were 22 feet long.
The treads and risers were all mortised into the wall stringers as well.