Ok I am ready to call testing complete and share plans...
Sorry it took so long folks.
It does seem to have extended my cook time somewhat.... Probably due to better control ie. no overtemp excursions etc.
The way I have wired it there are no modifications to the smoker just plug it in between the smoke generator and the main box and run the probe in through the vent and hang with some stainless wire. I looped the extra capillary tube and stored it under the back cover.
I also limited travel of the temp knob on mine as to not be able to accidently overtemp, I did this with a small pin drilled into the knob and another into the face of the box.
If you do not feel up to this task and still want one let me know and I will see what I can do to help.
Parts required:
1 Oven thermostat Part No. RS-5430-175
1 computer cord make sure it's same gauge or heavier than smoker cord
1 box at least 3x3x2 internal dimensions
solder and heat shrink
Here is the wiring diagram

When in doubt smoke it.