All you need is some paint, and she'll be finished!
The shape of the tank is interesting, and I am wondering about the temps over the whole cook. In my smoker (longer and narrower), the temps are hotter closer to the firebox. However in your case, the temps are higher on the opposite side. I wonder if the shorter but wider pan facilitates convection rather than radiation... I would like to see your temp averages over a full cook, especially once the pan on the side of the firebox is heated for a while.
Another thing is that if I want more even temps, I raise the end opposite of the firebox (probably facilitating convection), but if I do want different temps (for simmering beans), I lower the same end. Maybe once you are up and running you could do some experementation.
Nauti-Que BBQ Team
Pitmaster and KCBS CBJ & CTC