nice job..... I have hung a lot of stairs over the years. Not many of them as a finished unit though.... I don't miss it. I've probably climbed more stairs in a year than most will in a lifetime....LOL
We did a big contract not long ago, totaling 120 flights of stairs with landings, and handrails. I must have done about two thirds of them.
It started off as a few sets to get the job sorted out, remove any unnecessary bits, add on and alter to make it easier to fabricate and install.
I don't know how you guys build your stairs but most of the stairs I had to do were thread pans that would be filled with concrete..... Imagine having to climb 6 stories of stairs carring all you gear or additional pans only being able to step on the nosing of the riser approx 37 - 38 mm in width. My calves would be on fire. The risers were never poured til the entire stair job was done.