Nice work! Would you be willing to share how you designed/built the roof to your smokebox (actually, your cook chamber also)? I built mine so long ago that I forget how I did it. Key is how to install and keep firebrick on the roof? And then what is above the firebrick. I am assuming that you have firebrick on the ceiling of your firebox. An alternative might be to install a sheet of 1/4"+ steel I suppose. How did you do yours?