Your design was an inspiration. I just finished building one like this, except mines a lot less pretty. I'll post some pics when I find my camera.
Thanks for the idea.
Edit: Here's a pic. I used a Carlo Rossi gallon jug to make the coils. I just used its today for the first time. It took 5 gallons of wort down to pitching temp in about 10 minutes. This thing rocks!