UDS ALL THE WAY. Cheapest best bbq cooking machine you could ever own. If you spend sometime searching for the material you could end up spending next to nothing on it. I've built two so far and on both I may have spent $50. The barrel may be the most expensive part.
My arsenal, Stumps Clone, Two Modified offsets, open pit with grate and rotisserie,UDS, and a free to me Weber One Touch Silver 18.5" kettle