I don't have a build thread link handy, but I can tell you what I do, super easy.
I use a small pond/aquarium pump submersed in a bucket of ice water. I attach vinyl tubing from the end of my wort chiller to the output of the pump, which pumps ice water through the chiller. I direct the output from the chiller back into the ice water.
I'd recommend using the hose/tap first, until you're down to 120 or so, otherwise you're just melting ice.