Creating a surface from closed, orthogonal curves

I am trying to just create a continuous surface from the enclosed curves. I can’t figure out a command to do this cleanly. Do I need to explode everything and make individual surfaces on each face and then join them together in the way I want, which is sort of like a ribbon?

Assignment 1.3dm (35.4 KB)

Hello - try this:

Select all the curves and start BoundingBox. Accept the defaults. Select the bounding box and start Split and select all the curves. Then delete the pieces of the result that you don’t want to keep.
Assignment 1_PG.3dm (164.7 KB)