Salut Fred, here's one method that could be explored and refined:
-Blue Half ellipse sweeped on the three paths,
-Planar was used for the blue shape, created with the top three edges of the sweeped surfaces .
-Caps created with ellipses and planar.
-Model has been scaled 1/10 to join it in one solid.
-Rotated 90 to work with flow/curve.
-Legs have been trimmed (red)
-The blue surface have been trimmed and blended.
I imagine the Y shape could also been simply extruded, filleted and squished with the scaling handle.
Marc

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