Hi - I happened to see this posting and thought I'd reply. I am the guy behind the "Portland Tap". If you are still looking for information on this, I have a copy of the article on my web site Buesseler.com
(click on the "Portland Tap" button).
The design works great for me. It keeps the lines and faucets chilled, and I never have problems with fruit flies, or other contamination. More importantly, the "stealth" look keeps my wife happy.
Let me know if I can offer any advice, etc if you decide to build one.