Definitely got to get some pics up when you get this built.

I'd be a bit concerned about the support for holding up the 3 liter bottles once the bottoms are cut off. Since that's the strongest part of the bottle for support if you go nozzle down, I'd be afraid that over time the weight of the dirt and plant and fruits would pull wire up through the plastic, especially if they get waving really nice in the wind. I'm sure you can MacGyver something though. Maybe just cut holes in the bottom for a few herbs or suspend the whole thing in rope netting?

Sadly I have nowhere really good to do this - though I may have to think about that... (don't tell the wife!) Any thoughts on making these look less makeshift and more "decorative"?
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Experience is a hard teacher because she gives the test first, the lesson afterwards.