Well I'm super pumped up to finally post an ongoing forum of something I'm going to build. I'm always so bad about documenting it so I'm gonna post a lot of pics so people can learn from all the mistakes I'm about to make. I'm using a vertical 120 gallon propane tank that will be a horizontal reverse flow offset smoker. I've already cut the door and built a 24" x 24" x 24" firebox. The tank has a 30" diameter and 48" length cooking chamber. Here's my first pic of it with the lid cut open and hinges welded on. I'll be mounting this permanently on a small Harbor Freight trailer that I've already purchased.