Hi Pilou

Thank you for liking the image; it took me a lot of work to get it, thanks to the help I received.

Regarding the curves, I know they're the same. Curve "A" is the one 777RAVEN777 suggested, and "B" is taken from the outline of 777RAVEN777's extruded image; I didn't draw it myself, which is why there's a difference. If your explanation also serves the same purpose, then that's fine with me.

Thanks.

If you follow my process above you can make any curve with any number of Control Points!

here each closed curve A & B has 13 C Points! And well spaced after a rebuild!
You can select many curves in the same time and rebuild them!
If you want same length of one of the curve : make a Scale 3D (A / B) or (B / A) following result wanted ! :)