After doing a google search, there are many types of circular or spiral staircases. Do me a favor; do a google search on "spiral stairs" and send me an image of what you want. This will help me narrow down the many different styles so I can model it.
Have you ever tried the scatter and replicator tool in Vue? Have a look at this:) Ok its not as elaboratet as the models above but.....with a little calculation? you can make something nice. Why not try to make a cilinder,make a boolean operation with a other cilinder and apply the scatter and replicator tool to it???? Drugar