Unfortunately this is a complex organic shape. The mesh is very messy, over 1m triangles, but overall relatively accurate, and is the result of a photogrammetry study of a real physical object that I’m trying to get an accurate model of. The splines were traced from 2d pictures of physical templates and then scaled. There is really no way to export the many slices of the hull form that I would need to create the 2d for tracing and positioning as endlessfix suggests. The mesh is not needed for anything other than reference and positioning. I was hoping that the RealityCapture photogrammetry software would produce a smoother more fair mesh, but I could not get that to happen. So I’m using splines, created from physical templates made from foam board carefully shaped to the real object, and then attempting to create the surface using curviloft. Attention Sketchup team: a new feature that allows inferencing to be turned on/off at the group level would be a great addition!!!