provided that there are several methods in autocad to create the same model, I suggest you leave mesh and use the surfaces.I would like to start from a mesh sphere... is it feasible?
command revolution (revolves) to create the shell, then extrude the red spline, top and bottom, so that you completely overstep the shell.
finally pulls the shell with option superficie (strude quella).
heh hehgiving a nod is asking too much?