Probably not something that you could 'add' to an existing stairway unless
the supporting structure is there already, or there is no wall on the
outside of the stairs already, such as an open basement stairway that you
are looking to enclose.
Okay, my monitor ain't the biggest, but it looked like a raised detail to
me. Can't tell if it was built up, or milled down from a big plank. But in
either case, any custom millwork job shop could run one up for you. Like the
other guy said, the lower part is just a drywalled 2x4 stub wall.
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