@pilou said:

a brute method 😄 Thx Fredo6 and its versatile Curviloft 😎

Kill surfaces and segments for keep only circular curves

you can make the same with other if you want truncated conic volumes

https://i.postimg.cc/rpYZyFLG/like-thatt.jpg

Funny i have made a conic form few days ago for the free Simlab Composer Lite 😄 (max 1920 *1080)
(geometric caterpilar curves + spheres )

https://i.postimg.cc/gjZFpM2m/carterpilar.jpg

Thanks! I used the Skinning tool and that did exactly what I wanted; creating a surface along the arcs I created to get a smooth transition from the lozenge to the circle.

Thanks so much for helping out. I am not back on track!