Got it all together and in it's home.
Took the door off the mini-fridge, added some weather stripping to the front and butted against the opening. I'm using a couple of cheap tie-down straps to keep it snug against the wall of the chamber.
I put about 6 gallons of warm water in my fermenter and tested out the pull-out tray. The glides deflect downward a little, but the chamber does not tip forward at all. Glides function smoothly with the weight.
Time to test it out. I dropped the temperature probe into the fermenter full of water. At 5:15pm, 37.2 degrees C. I've got it set for 20 C; will see how long it takes.