I think there are better ways to do something like this with surfaces in SW, but I am not quite there yet. I would approach it using the Loft feature and multiple spline perimeters distributed on multiple reference planes. It is certainly not perfect, but take a look at the example (posted). You can alter the plane spacing as well as tweaking the lofting points about the individual splines and also the shape of the splines.
Like I said, I don't normally do curvy stuff, but this one approach...Good Luck!
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SD2 - Stock - Enclosure - Heated Bed - Glass Plate - Auto Fire Extinguisher
Ord Bot Hadron - RAMPS 1.4 - Bulldog XL - E3D v6 - 10" x 10" PCB Heated Build w/SSR - Glass Plate
Thanks for All of Your Help!