Intersection between tessellation and curves from metaball/surface

Hi there, I'm new with grasshopper and I'm trying to work on some school project.

Thing is I'm trying to make an intersection from a tessellation and some curves I took from a metaball definition. I tried placing the Trim with Breps component and i get both the curves that are outside the tessellation and the ones inside.

but then I try to make a surface with each curve, but i can't because they're not closed.. Does anyone know how to make an intersection between two surfaces? (I also tried with Brep | Brep, and Solid Intersection, but none of them worked) Or how can I make a surface with the resultant curves?

Hope you can help me! =)

ak'