I was asked about my hybrid smoker/grill so here is some info.
My current Smoker.
Here is how the modifications evolved over the years.
Six year old standard Traeger Lil Tex Pellet Smoker with heat and smoke provided by pellets which is consider by KCBS to be competition legal. Replaced the 3 position control with a digital control, added a second shelf, modified the auger by removing restricted rod, replace the standard auger motor with a high speed auger motor and added a chimney.
Added Smoke Daddy and A-Maz-Smokers
Smoke from Smoke Daddy. I have since moved the input below the drip pan.
Designed an Auber PID Control System, based on Billy Merrill concept, and built it using off the shelf products. Added a user adjustable airflow system for the Draft Inducer Fan. Rebuilt the high speed auger motor to provide more torque and added a user adjustable auger speed control.
Added Rock's Stoker with wifi setup to provide monitoring of up to four meats and pit temperature. Added an interface between the Auber Controller and the Rock's Stoker which provides me the capability to adjust pit temperature remotely through my home network or the internet. This also provides me the capability to program pit temperature changes based on time or food temperature. This is KCBS legal.
Attached a Master Built Smoke house to increase cooking area from 422 to 1139 square inches and to hang sausages. Heat and smoke travels from the Traeger through the MB and out of the MB upper exit vent. I left the propane installed to provide the additional capability to operate the propane side with or without the Traeger operational. Also added an rheostat controlled electric element to provide heat augmentation in the MB with smoke from the Traeger. If I use the electric or propane the unit is no longer KCBS legal.
If anyone is curious here is a video I made showing start up and operational feature up to temp 180.
Temperature control of an standard Traeger is un-stable at best. Here is a video showing the stability of this system at 192 degrees.