Wow. Very nicely done. Very beautiful setup - tank fish stand and all.
And thanks for mentioning google sketchup, I'll be building a tank and a stand soon and wanna see what I can do with my pencil sketches on the computer.
Google SketchUp is the way to go. I spent a lot of time playing with the design in it before I came up with the final plan that I was happy with. You also get a very good idea of what the final product will look like in 3D.
Where did you get the driftwood? Awsome everything! I bow down This guy I know is gonna quote me on a hood and diy filter...for a 185 gallon what would that run usually?