@Troy OK, here you go ... please forgive the out-of-focus shots (bad iPhone, bad iPhone).
The first three are my hotGreen11 with the Smokenator in place just below the custom cooking grate. Looks like 6" into the grill chamber.
Size of the water chamber ...
Here are three of the Slow-n-Sear in place. It appears to be lower (about 1/2 inch below the cooking grate) and at least 2 inches deeper into the chamber.
This view is from the opposite side of the chamber ...
Hope this helps ... don't expect a gold star for this effort
BTW I know the Smoke-n-ator comes in three different sizes for the three different size weber kettles. Did the User Manual help at all