From what I know talking to my old man, this is a true indirect heat build. Both the barrels are 55 gallon drums and were purchased un-painted from a local barrel dealer in-town for cheap. Bottom barrel is lined with firebrick and also has a firebox made from Expanded 3/4" Stainless that we whipped up with little fuss. The double flue design works great at dialing in the temperatures and there is also a vent on the fire door as well as dampers on the chimneys for further fine tuning.
Here are just a few pictures I've snapped in the last few days while practicing this new tasty hobby. If you would like more detailed shots of a certain area feel free to ask and I'll run out to the back yard and see if I can accommodate your requests.
Since Dmccurry was lucky enough to build this at school overall costs were below $250 I believe. He can verify that if I'm wrong. I can tell you that it works like a dream!
Since I don't plan on smoking anything this week I'll be painting it up with some high temp Krylon BBQ or whatever my local ACE Hardware has for grill paint. I need to add another thermometer or two for more accurate temperature monitoring. This is one hell of a smoker!