Skinning is ideal for creating tensile membrane structures, covering complex polygonal frameworks, or generating a surface from a set of contour lines for landscape modeling. The tool works best when the framework it is skinning is made of contiguous 3 or 4-sided "quads" (four-sided polygons).
While newer iterations like Curviloft 2.0a exist to support modern versions of SketchUp, for users maintaining legacy workflows, studying the evolution of SketchUp extensions, or troubleshooting classic setups. The Three Pillars of Curviloft curviloft 18