The two sides of the unit can be separated by gently disconnecting the white
double-wire cable (with the white connector in this picture) as well as
unplugging the red and black wires at the terminal strip.

Looking inside the unit, it appeared that the upper-left-hand portion of the front panel
could hold the temperature controller without it hitting anything inside.
I cut a sticky-note paper to the size of the whole I needed (about 4 cm) and
positioned it where I wanted it, and marked the edges.  I also wanted to bypass
the temperature controller for 'factory' operation; a good spot for that is
just below the temperature controller.




(continued)