For a couple of days now I’m trying to make one closed surface of the model that is attached, but I won’t succeed.
I tried several ways of Sweep and Curved Network but I don’t get a nice smooth surface.
Is it possible to get one closed surface of this model anyway?
Something like the attached - does that do it? The main body appears not to be a true revolve, from your curves, so I made extended versions of the curves and lofted, then matched the top to a circle to get at least that bit round. The arms are network surfaces and the transitions BlendSrfs.