BoXXi, that is wicked cool! (Just how many projects have you got going at one time?!)
Parts of my unnamed DXtheme so far:

The white part of the start menu is supposed to be a navigator; shortcuts to usual folders along the left side, contents appear in the window when clicked.
The side with the calendar is where the usual extra widgets are supposed to go (media, weather, meters, etc).
The start menu is my biggest challenge in this theme due to the level of interactivity and integration, but I'm taking it a day at a time.