You really like to build them eh? I have followed quite a few of your threads on HBT.. I see no issues with what you are proposing here. My only real concern is that you do want to keep your box pretty full. You could, if you have other coolers, just start smaller and move your gear to another cooler as you got more sticks.

The other one would be that the cigars tucked back there by the heating pad might get blasted by the quick heat. If you are doing it upright, you could just dedicate an area (shelf?) for the pad, the beads, and the fan, to keep the sticks away from any major temp changes.

I am in Arizona.. and have a hard time keeping my humidor below 70* in the winter =)

Looking forward to seeing some pictures!