What mods did you do? I have one don't use it much, but when I did it was hard keeping it constant. I built the big one on the trailer and put a wood furnace on the end with the dampening system still intact, with it and the stacks I can control the heat very well.
Yeah, that rig of yours is a beaut. I'll bet you can crank some meat out on that.
The mods are: extend the stack down to grate level (with a metal flexible duct), I fab'd a large charcoal basket from expanded metal (to hold more wood/coal), put thermometers at grate level (the one on it is about 30 degs off of temp at grate level), and made tuning plates to duct the heat to the other side of the chamber so the firebox side isn't so much hotter than the other end.
Google "Chargriller mods" and you will find websites dedicated to showing you how to do what I was saying, with pics. Good luck!