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Is there any way in Plant3D or ASD to create a sprial star case around a tank?
As I can see structure doen't support this at all and ASD only has as spiral stair case with a fixed diameter based on the few provided standard steps.
This has been requested a number of times but we haven't been able to get to it yet.
You might try modeling it using the helix command to layout the path and then using the array path command on a stair tread to make the stairs. You could probably do something similar for the handrails.
That's what we did and it turned out pretty good. See attachment...