What is this process called.

I'm kind of trying to learn rhino and grasshopper while working with it at the same time, ad i found this script that it similar to my project.  I'm trying to find some tutorials which teach you how to do it, however, i'm not sure what this process is called.  The structural aspect of it is ribs i think, however, the curves and terrain like form i have no idea what to search for.

Can anyone help? Even better if you know of any tutorials which teach you how to do this that would be great too.  

I'm trying to do exactly this, where the ribs are laid out aswell so i can cut them to the exact size and make a physical model of it.  The easiest method would be to use this model and change it to suit my project but i need to see some tutorials to learn how to do that.

I've attached the rhino and GH files as well, which i found off the net so you know what i'm talking about.

I'm not sure how to create that curved(terrain) form and then convert that form into a rib structure which i can turn into 2d and laser cut to build.

Regards