Hi!
I am trying to create a monolithic curved stair form around a irregular plan shape and need help on how to achieve it.
We want it to resemble an elegant smooth sculptural form (probably plaster) similar to that of Harry Seidlers.
http://thedesignfiles.net/2016/02/shell-house/
The problem is that it is not a properly round shape, and it is created from a series of ellipses, as you can see from the plan 
I have been trying to use curviloft plugin and have not had much luck.
Ideally i would love if there was a plugin or something similar that can create a smooth spline in 3d, so i can follow the form of the stair down (cant use a helix as it does not follow a circle) and use that as a path to extrude via 'follow me'. Does anyone know of one?
Or any other suggestions?
Is there anyone who can help?? We have a deadline for tomorrow and am running out of time 