Okay, doing an "on the stairs" image was not too hard.
For "facing up stairs", "turned left on stairs", and "turned right on stairs" will take 4 walls each assuming that you want to stick to the three stories format, and it is scalable up, like twelve stories, with no extra walls needed. This is just a stright stair, nothing fancy.
I haven't started on the "facing down the stairs" wall yet.
I am currently using Dinonykos "wya_Stonewall" as the wall to put with the stairs, and the stairs are drawn, but not textured.
Here are two shots - ss01 is on the stairs facing right, and ss02 is on the stairs facing up near the top (this uses an already existing backdrop, but I'll need to make some new ones with a lower horizon line for higher up the stairs like this).