Work is progressing on my cartoon + line dungeon kit and as requested I've now added a spiral staircase. Is this the sort of thing you had in mind? It does a full 180 degree turn. With a bit more effort I should be able to join several together on top of each other to make a full staircase of any height. This image shows seven different components joined together to make a scene (not counting the iron rings). There are already quite a few others prepared but I need to make minor adjustments to them all so that they interlock perfectly before I release them. I'm also working on a variety of floors and ceilings. I haven't started a vaulted ceiling yet, but it shouldn't be too far away.