Suggestions/ideas to create faces on object

Hey guys, fairly new to grasshopper, but I’m just looking for ideas and suggestions on how I could fill in this frame like object. Kind of imagining something slightly thinner than the frame to create a fill. Not looking to make this object solid.

The little purple bit is where I’d like to fill (repeated in other frames)

Here is the Grasshopper file for anyone interested. Cocoon (14.5 KB)

There is a plugin MarchingCubes you have that I don’t. So I don’t have the full definition. I’m fairly new to grasshopper but I would probably get the perimeter curves and use network surface to create the fill. Then offset those surfaces to the thickness you want. How to apply that to the entire structure is something a little beyond my knowledge though.