This is the first of a few mods I am doing after reading tons of forums and articles...I never read anything..Hence I am a man...lol
First I did was get some salitllo tile from my work, The Home Depot, I cut them into about 6'x 6" Saltillo tile never is 12 square so some pieces were shorter than others. I made it work. These are the lining of my firebox to help hold the heat.
I then was going to raise the rack up with some angle iron for the coals but after looking at the vent location with grate in place it is almost half way up the vent.
I then got some sheet metal(NON GALV) and made the smoke stack come down to the level of the grill, this will help hold the heat and smoke in. I forgot to get a picture today but I will tomorrow before I start my smoking of a brisket and finish the last mod of making a deflector for the heat and smoke to stay closer to the bottom of the smoker that will be lined with bricks covered in tin foil to help hold heat.