We have gotten many questions about the stairs: They were custom designed and built in place by the builder - and are not available commercially. The entry doors were also custom made.
I don't know, but I do know that the builders were Paradise Construction, and this house is in Massachusetts. Might be worth tracking them down if you want them to build you one.
Nice design, we could manufacture these "custom doors" for you at http://www.DecoDesignCenter.com It has satin sand blasted glass finished in dark ebony color with pewter clavo nails it appears to me.
can we get away with windows that big in front of the stairs without it being ostentatious? Does it even make sense with no real view from our front door?