I’m not saying it’s impossible 🙂 but in my opinion it could be made easier.
At this point you start removing faces, but part of the video is cut out. So part of the modeling is done offscreen.
https://cgcookie.com/lesson/modeling-the-bridge?wtime=559 (here you are removing faces)
https://cgcookie.com/lesson/modeling-the-bridge?wtime=566 (here you suddenly have added some faces back in.)
Anyway thank you for your help. These courses are fun and useful.
