I'm not so good at relating Instructions as they apear in my head, but I'll try.
I love my plated Tejas and have proven it on many Smokes.
First , how high do the Tiles set above the bottom of the Smoker when just placed in? I 4" or so you should be good as that will give appox.4" to 6" from thier tpo side to the cooking Grate..
Now attach (weld or bolt(with a gasket between the to help in future R/R's , to the level the Ceramics are and fasten it there, you should have a 4" area. \
Next , attach a Baffel( in the FB side at 30* and 4" long, to caych the heat easier and force through the Throat to the Cooking Chamber.
This finishes the Mod. Now Play with it and seal the Smoker as much as you can. You'll use less fuel and get better Smoke from using less Wood. I burn to embers a lot, this insures a 225*F heat(when intakes are set right , and you can adjust the plates so the heat comes up where you want it and the Smoke Is still constant on the Meat. Ceramic is also a great heat sink , with them , you may need (after heated) wood to go a long way.
Good idea, I jealous i didn't come up with the Ceramic thingy, Points for you...
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Have fun and . . .