How do I make these types of curves in sketchup?

Does anyone know how to create these types of twisted curves on sketchup? I tried using bezier spline first to create the outline of the curve pathway I wanted, component stringer and then curviloft but it turned out looking broken. If anyone can advice on what plugins I can use instead or give a link for a youtube video tutorial for this, it’ll help out a lot.

One method, with Vertex Tools, SUbD, QuadFace Tools and Fredo JPP