Here is a description of my DIY Smokenator setup. I just couldn't bring myself to spend the $75 on the real thing, so here's what I came up with.
$20 for a 22.5" Weber kettle on Craigslist.
$6 tortilla comal from Food City in Tucson.
I cut the old grill that came with the used Weber so that it would hold the comal straight up creating a wall between the coals and the meat. The comal is made from pretty thick heavy gauge carbon steel. I did ribs and chicken yesterday which received good reviews. Below are the pics. I'll update results as I test it out more. I'd be curious if anybody else has tried this. Ironically, I'm thinking about buying a Smokenator 1000 so that I can test the two methods. It cost $6 to make this thing, $26 total if you include the Weber kettle.