I bought a set of plans for the "mini gravity feed" smoker. There is enough information in them to build the smoker. They are 27 pages long, and show the measurements and materials for all of the parts for the smoker. It's not a step-by-step deal, but the first page lists an sequence of steps to build the main components in.
I have a build thread on mine here: viewtopic.php?f=56&t=4708