It's been 4 years since Bobby originally created this tutorial and it's still going strong! Thanks Bobby!
I had not soldered before but decided to give this a try. I found a little scotchbrite makes you look like a copper sweating pro.
I also added a bypass tube with a pinchclamp (clamp not shown in pictures) so I can whirlpool after cooling. It works great at dropping the temp with the bypass closed, then whirlpools sufficiently once the bypass is opened. I added a PVC shutoff valve to the coolant water line to vary the flow so I am not wasting water.
This is probably the best DIY I have done yet to improve my brewing.