I finished up the ribbing sections last night! I was a little worried about the finished length, but since my original swatch grew a bit I figured I could block it to the length I want:
So far, so good. We'll see what it ends up being when dry. If it is still shorter than I would like, then I'll just rip out the bottom ribbing and add a few more rows. But I'm keeping my fingers crossed that I won't have to!