Skin over ribs - How would you?

I am modeling a large room from these curved ribs. I need to create a shell that wraps the outside of the ribs.

Pretty basic! I know how I would do it, but I am sure there is an easier and faster way. How would you?
Joel
SUQ.skp (4.0 MB)

Click in sequence on Scenes 3 and beyond on this SU file for ideas.

The last 2 scenes are as per Dave’s suggestion.

SUQ - JL - 2024-07-20.skp (4.5 MB)