Many thanks for the very detailed answer(s)!

So that is your "first" try of complex Moi object ? Very convincing result! Bravo!

You don't speak about the projection "nearest point" option - does this will be useful or not in your process ?

When I speak about "3D solid" result it's just when you "Join" all surfaces Moi makes a unic "Solid" waterproof (if surfaces are well build)
Indispensable for 3D Print or future boolean operations between volumes!
So maybe that takes many or few time or not - or maybe that is not possible because some problem are always present.

For your object that is one minute - and result is not a solid but stay "Linked surfaces"
So maybe some little adjustments are necessary for have a 3D printing object...
But like is it's yet pretty cool for just render images or maybe animation.