Pasting curves of diagrid on loft

Hey all!

I joined you guys on this forum because for the first time since I started using GH I can't find an answer on this forum and the internet. It's because I simply don't know what keywords to use!

The case: I modeled some geometry in Rhino and manage to decompose it in GH up to all the individual curves. The next step would be to create a curve between the points on the divided upper (elliptical) curve with the points on the divided lower (circular) curve. The curve (white) just has to follow the loft of the geometry you see as well. In this way I want to paste a simple curve on a loft, resulting it will twist around the loft. Hence constructing the beginning of a diagrid construction. :)

I tried a lot of curve features, but I just kind find one which uses a loft (I can't get planar stuff running!) as some kind of reference. After this I expect as well I'll need to resolve the fact that the curve will start curling around like a helix instead of simply finding the fastest way to its end point.

Thanks in advance for any help or suggestions!