A few changes to a Drupal template to be completed today

I have an existing Drupal site on my server. The client would like the layout of the home page to change. I am attaching before and after screenshots. Only the home page should change, the other pages must remain exactly as is. You will be given shell access to the server as well as Admin access to Drupal. I would like the new look to be an addition theme, so that the site does not experience downtime during development. I would like the work completed between now and 20121101T020000Z (10pm tonight in UTC-4)