Spiral staircase that follows pole that gets wider at top

Hi there - this might sound confusing.
I have created a cylinder shape glass dome in sketchup its about 7 meters on the basement level and gets wider as it gets to the top of the building.
I created a spiral staircase to go around the dome (again in sketchup) - but the stairs dont fit snug to the dome all around.
I have downloaded rhino 8 and am new to it ! I have done so research - I thought I could export the sketchup skp file into rhino - as well as the curve shape that I have traced around the dome. Can I use the array along curve tool in rhino by selecting the current staircase then selecting the path so it holds to that shape ? sorry if that’s confusing is there a way I can create this new staircase that fits snug all around the dome - just having difficulty as the dome gets wider at top! Any ideas or advice would be much appreciated!!

Hi Bea - best if you can post the file, or sesnd to tech@mcneel.com, with a link back to this topic in your comments.

-Pascal

ok will do thanks

perform - stairs and dome compartment.skp (273.6 KB)

I’m trying to get the stairs to fit more snug - I have been recommended to use rhino to do this, how can I do this?
many thanks