charcoal burning box for low temp jerky

On an old thread, someone mentioned using a coffee can to hold the charcoal while doing a low temp cook for jerky.
The goal, I think, is to limit air to the fire, but allow airflow through the smoker.

I'd like to use that idea, but construct my own box from metal, one with a solid bottom and 3 sides (one open side for fire-tending). I would set the box on the charcoal grate and point the open side at the access door.

Would Aluminum flashing work for such a job?
I've read that Galvanized is not safe due to the Zinc.

Has anyone tried such a thing?
I did have success holding low temps for my first crack at making jerky (held 125 deg for 3-4 hours then raised to 150 for 2 more), but I could only do so while severly limiting airflow through the smoker. I repeatedly wiped condensation from the smoker lid and changed the wet foil on the dry water pan to reduce moisture.

I use this for cold smoking cheese.




It's a steel utensil holder from Walmart. The lid is aluminum. A few briquettes without the lid can get the smoker to to 125F easy. I'm going to try some jerky soon. I was thinking of smoking it for 2 hours and then finishing it in the dehydrator.

Looks good, I like it.
I was looking at a small stainless steel trash can the other day, this looks better.

Do you or will you use the water pan at all with this?

The water pan is in place but I never use water. I always use a clay pot in place of the water.