Thanks for reply Michael
Never looked in the directory where MOI was installed:) Too busy with figuring out how NURBS work.
I created a script that calculate a surface of a mesh in Anim8or, but I think calculating NURBS surface is more precise!
I uploaded two files:
The first one is the closed splines that should form the solid
The second one is my try to do that by trimming splines and using sweep command.
The Idea is to get the solid smooth as much as possible.

I am pretty sure that my technique is bad, than impossibility of modeling this shape.