Closing a face made in a "cut away" wall

I created a wall that needs to be “cut away” on one side. I used the freehand line tool to create the cut away line, but I have some open faces (Image below). I think I should really start over with with creating one face, modifying it, and then extrude, but I thought I would if anyone had any ideas of how to close these faces another way before I do that.

You might be able to do it with Fredo’s Curviloft.

If you can upload your SketchUp file, you will get a more conclusive answer.

For the sake of time, I just drew the wall again making the modifications to a single face and extruding it. It worked like a charm. Thank you for the suggestion though!