I saw two converted kegs for sale on Craigs List today. One of them included a 1" nut for a heating element.
http://cedarrapids.craigslist.org/for/2926369941.html
http://cedarrapids.craigslist.org/for/2926376633.html
Pretty good price, when you consider the cost of parts and the value of your time to do it yourself.
The listing says "Robins". Is this someone in the group?