How to use SpaceTrussStructure 2 (lunchbox) with a non-rectangular form?

Hello , I’m a beginner in grasshopper and in the lunchbox plugin.

For a project, i want to design a structure between 2 driver surfaces. In the example, I have 2 surfaces build a “curve: interpolate points”, wich i made a surface from with planar. Then i gave the surface an organic form by manipulation of the control points. Ther was no trimming involved while doing this.

Still, i have a rectangular truss-structure which extends beyond the borders of the organic surface. I want to keep the structure into the border of the surface.

How do i design a structure that keeps between the borders of the organic surface?