That's a very old screenshot of my UI. This should help: http://evilempireguild.org/misc/SatUI_explained.jpg That's at 1920x1200 resolution, so available space will vary if you have a smaller screen with lower resolution.
The only thing that isn't really identified in there is some sort of viewport addon to make the space at the bottm. CT_Viewport ot whatever. And Digits is released now, there's a sticky for it in this forum.