Cambridge question

I'm getting increasingly nervous about my RYC alpaca dk and Cambridge pattern. If anyone has been following Polly's adventures with knitting this pattern, you'll understand. She makes a good point about the ribbing only looking good on Kate Moss. I've finished the back of Cambridge and, although I love the yarn & pattern, I'm worried about the fit. I was going to keep it for Grace if it didn't fit but I'm feeling selfish. That yarn is fab and would make a gorgeous wrap or shawl. Do I carry on or rip out???? Thoughts??