list groups of contour curves by plane

Hi Guys,

So Ive been doing some work on a car body which is going to be cnc cut to form the body. 

I have been given a 3d scanned model (wich is full of holes) after countless hours of patching I still cant clean it up enough to use the any of the many contour difinitions which you have all so kindly shared. 

I have managed to get the model to a point im happy enough to manually stitch each curve together. 

What I am looking for is a way to see a list of groups. using the contour command I have grouped each curve according to plane. I would like to be able to make a quick grasshopper definition to go though and export each group into a seperate file. 

Keeping in mind I only have basic knowlage of grasshopper.

If anyone has any ideas that would be great!
Thanks very much!
M