I don't know what you've got planned for the "left" div, but since it seems to be going to sit beneath the menu it would be more logical if both the menu and the "left" div to be at the same level, structurally.
I don't feel this menu should be part of the header, anyway.
Otherwise, it's coming along nicely; it wasn't going to be an easy task from the start, considering the rather complicated header image, but you're well on your way.
Perhaps you could add a little more placeholder content to give a clearer indication of the intended use of in particular the side boxes -since of course "footer" is kind of a no-brainer...