Otherwise to build it more directly in place, you'll want to split those curves into 2 pieces to use as rails for a 2-rail sweep like Pilou shows. Shelling may have some difficulty processing a sweep like that, you may have to create an interior surface manually by doing another sweep for the inside part instead of using Shell if you go that method and shell has problems with it.

- Michael

Hi Rudy,

Here's a basic version I did based on your supplied curves.
It still needs to be shelled or hollowed out.

I ended up splitting your crescent moon shape & using them as a 2 Rail Sweep.
I also tidied up some of the points in those curve towards the very ends.

Hope it helps, Colin

Edit: I just quickly did a hollowed version.

Hej Guys,
thank you so much!
I have all these great ways to play around...

Wish everyone success.

Best,
Rudy