Built a UDS over the summer. Just joined the group a few days ago. Thought I'd share my build and process.
Got a lined drum from a craigslist ad. Found a local guy in Ft Worth that sand blasted it for me. Local fire department would have visited me if I had done a burn and for $30 it was worth saving the time not having to grind it all down. I decided to build mine on a cart even though at the present time I don't move it anywhere. Found an old kenmore grill that I salvaged. Built the shelves using diamond plate that I cut and bent in the garage. Hardware, paint, paint and more paint she was ready for seasoning.
Specs: Three racks, pizza pan heat diffuser, 2-1" holes with ball valves, weber lid, unknown bbq hinge (need to install), 18"x10" fire basket, 2 cans flat black, 2 cans gloss black, 1 can metallic silver, and a whole bunch of eye and u bolts to hold it all together. Cheers!