Hi rich, nope, it looks pretty good, you might try finding a small fan to force air through the pipe, this might keep it cooler. Since you don't have this in the current setup, you must have inlet holes in the bottom pipe to draw air in from below??
With the vertical sides, the firebox will work much better, you should have fewer clinkers, the coal should bridge less, and burn down to the grates better. It now looks like a 'real' coal stove, not a compromise wood/coal firebox.