Problem with contouring and creating a solid skeleton

Hi Guys,

I have a problem with generating a skeletal form from a brep surface. I wanted to know a way form the countoured object I've posted below. I've also attached the grasshopper script and the rhino file.

Please help! Thanks!
Chair_03_A.3dm

Chair_03.gh

I'm trying to replicate this chair in grasshopper

This is how far I've gone so far. However the main problem is creating the solid contours in the long direction, without closing the ends of the referenced brep. In the actual image of the chair the ends of the chair are open.