Recreating this Geometry and Data Management

First of all hello to everyone

Straight to the issue, I want to recreate this geometry and vary it. I have been working on a simple definition, but got stuck right now.

I have attached the definition.

The problem is that Im trying to generate the longitudinal skeleton lines. I have the points, and just need to interpolate them. Thing is when I interpolate curve those points, the curves generated are the arcs, which I already have. I need to change the data structure so the line goes through points longitudinally. Thanks for any help!