Creating roof over series of ribbed structures

Hi All,

I'm new to grasshopper but thought id give it a go as the potential looks amazing.

I have however run into a few problems recently. I have manually drawn a series of rib that will form the structure of a building. vertical walls curving to create the roof. Kind of looks like a rib cage at the moment. The ribs start relatively small nut increase in size as you move along the building and then reduce again. I am trying to use grasshopper to create a mesh to go over the ribs which will then be used to form the walls and roof.

I dont really know where to begin with this one so any help would be appreciated. Thanks in advance from a newb