Hi there. I could use some help, and this looks like the place to go. I've been lurking here for a few days with ulterior motives (stealing ideas). It took me a few days just to get through enough of it to get a rough idea of what I want to do here. I had to correct a LOT of mistakes in my design. (Seriously, I didn't have a clue) Let me start with a little history; I work in the maintenance department at a prison in Taft, California. There was what you might call a legal "scuffle" between my coworkers and the management over some lunch hour issues. I stayed out of it, feeling that the really good pay we're getting is enough to compensate. Regardless of whether or not I agreed, the guys won their case. So I'll be getting some money that I don't really feel right in taking. As it happens, during this year's in-service training we were told that the staff barbecue actually belongs to the inmates because some profits from the commissary were used to build it. The BOP doesn't want staff using it anymore. So here we are. This is my 7th or 8th remodel: I'm still tinkering with the stack(s), tongue and jack configurations, but this is the general idea for the chamber and firebox. I started out with a Harbor Freight trailer and a box that was wayy too big: I'll be cutting it down and welding it back up this next week when I start my vacation. In the meantime, I'd like to know; With the configuration and sizes as shown above(24"x24"x37" Chamber & 20"x20"x18" insulated firebox) Do you guys see anything that might cause me trouble on this build? -Aside from the stacks, which was my other question... I want to do twin stacks to make the smoke flow evenly. How do I calculate this?