So I grabbed the container. A 25-ish liter container with a lid with side snap locks. Nothing special. I hoped it wasn't too efficient at retaining heat either. I'm counting on the thermal losses here to lower the temperature.

Drilled a hole in container. Installed gland and AC cord.

Connected the phase and neutral to the circuitry inside. Connected the GROUND to the tray assembly. This way we can touch them while they're running. 

I had previously set up a temperature and humidity meter in this room in order to know the starting point right away without waiting for the meter to adjust to the room. It read 20C at 45%RH.

I put the lid on the box and plugged it in. I kept an eye on it at first to see how quick the temperature would rise. I didn't see anything too concerning so I started checking on it every half hour or so. After about six hours it stabilized at around 29C. I expect the RH would continue to drop, especially if desiccant is added.