I’m not sure how many of these have been made. I basically put together a $60 sous vide cooker that meets all the specs of the $450 “Sous Vide Supreme” that you can buy off amazon. Here are the links to the 6 part series I wrote on assembly and testing. Hope this helps/inspires someone like me, who prefers a screwdriver and an Arduino to shelling out hundreds of dollars.
Part 1: http://abstractengineer.blogspot.com/2010/09/arduino-projects-1-sous-vide-cooking.html
Part 2: http://abstractengineer.blogspot.com/2011/01/diy-arduino-sous-vide-cooker-part-ii.html
Part 3: http://abstractengineer.blogspot.com/2011/04/taes-diy-arduino-sous-vide-cooker-part.html
Part 4: http://abstractengineer.blogspot.com/2011/04/taes-diy-arduino-sous-vide-cooker-part_17.html
Part 5: http://abstractengineer.blogspot.com/2011/04/taes-diy-arduino-sous-vide-cooker-part_5230.html
Part 6: http://abstractengineer.blogspot.com/2011/04/taes-diy-arduino-sous-vide-cooker-part_23.html