There are no finished tools that does this, so you would have to do some manual drawing. If you have/make a single stair symbol, you could use the Symbols Along command to place them along the wall at appropriate distance/angles, and it even allows for a constant modification in scale if you want to use the effect from this image, i.e. that the stairs gets smaller and smaller to provide an illusion of them going down..

Very nice. Love the use of color key. The disadvantage with color key is that you can't really view the map at all with effects off, but it is a great effect to do a lot of things quickly and easy to change later.

Those of you who are active blog readers may already have noticed since I did publish it a week ago, but part 4 of my XP development series is now out, and it focuses on interacting with some of the core functionality on the CC3+ side of things, namely being able to interact with macro variables and call CC3+ commands from an XP.

Sorry for taking so long for the 4th part. I love writing these, but they also take a lot of time to prepare.

Those lines reminds me of the TCP 3-way handshake.

They are meant to be stairs, right? Perhaps making them with some steps and not just lines?

I was also thinking, since this is a cross section, and that hole in the middle still have a backing somewhere, perhaps apply a faded out version of the hatching as a background (perhaps with a tunnel for the stairs?)

And filling the sides with hatching did look much better than just edging it.

Considering that this is a side view, I would probably try out filling the area with hatching. It just doesn't work the same to just have edge-hatching as it does on overhead maps.