Hi Bravlin,
The biconcave script will give a 1/4 lobe profile in the +x direction, mirror the 1/4 lobe profile and join to make a 1/2 lobe profile of a bilobe, in +x direction.
This half lobe profile can be 1d scaled to stretch it out.

Using biconcave again for a thicker 1/4 lobe profile. Mirror it also, and join to itself, and rotate to -x direction.

The above two profiles are the two sweep profiles.

Draw a tiny circle at the origin for a sweep rail.
Draw a larger circle at the radius of the second lobe profile, for a second sweep rail.

Do the Sweep

- Brian