We're pressing ahead with our redesign and migration into Drupal of our flagship site. We created a .jpg image of the basic layout and "look-and-feel" we want for our new site that now needs to be realized as a Drupal theme.
We've now completed the template site to which we can replicate in order to migrate our 70 affiliate sites into a single codebase, mult-site installation of Drupal (as per this page).