Neighbors

Hi,

I have this structure consisting of 28 panels. Based on a mesh structure, I've extracted all edges and offset them inwards). Now, if I want to group, in a data list, the point "sets" (read: the two points that are just opposite of each other on each panel), while also getting rid of the points that are on the outer edges of the structure, how would I go about and do that?

Would the best way be to use the "ClosestPoint" component, or is there a smarter way to build a definition that automatically pairs the needed points?

Basically, I need to create a vector between the pair of points, so that I can begin working with connecting geometry. 

I've attached Rhino file and Grasshopper definition.

Any ideas or comments is much appreciated! I hope someone can help me out.

Thanks,
Claus