I see no screenshot attached. However, having worked in the graphics field and composed large Org Charts similar to what you speak of, I would not attempt using Word or Excel for such a project. Microsoft Visio is the tool that I have had the best experience with. The true teller of what program you should use is what you want done with the chart (or, how it is going to be used) once you are finished.

On another note, I have never used SmartArt so I could not assist you further in that regard.