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Draw a prismatic shape representing the reduction in cross area and then use a spinal bend to make it circular, from there let your imagination take you where it may and use this geometry to make the parts.
Get rid of rounds, copy and paste the surfaces to another model. Put in some datum planes, cut off the offending geometry, place some points in space where you need them, make some curves with construction geometry. add some datum curves through points. Add the VSS feature(s). merge in the new smooth surface, cap the ends and solidify. Or thicken. Getting the order of of what rounds should be before the shellor thicken and what ones need to be after b.
I would start over and keep everything surfaces until you have the shape right.
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