We really only have one project goal this time around: to take a visual design and convert it to a CSS-driven layout. This simple goal contains a trio of more specific goals, however, especially since we're creating this design for the CSS Zen Garden.
What we'll be doing is combining two very common situations in the life of a Web designer. The first is an attempt to reproduce a layout that a visual artist has created; this often happens in large companies (or any other organization) where the look of a site is under the direction of artists, not programmers. The second situation is one in which you have unchangeable markup that you need to style. In this case, the markup is specifically set up to make CSS layout easier, which is a good thing.