It is possible to model something like this in MOI. I took a quick and dirty 10 min crack at it because its late/early here. Blocked out the shape in rough with a 3 spline vertical loft. Then used a "through points" spline with snapping to draw rounded spline profiles around the blocked out solid. Think of it like threading short loops of string around something (wrap some string around your forearm and you'll get the idea). Too late to write it up in full. I'll be back later to explain it more fully.