Hey Jeff,
Once you get that thing made, get yourself two tuna fish cans filled with cat litter and put them inside. Much cheaper, and works as well or better that a Golden Rod for moisture protection. Clean the cans well, load them with cat litter, and cap them with plastic wrap and a rubber band to hold it in place. Poke some holes in the top and place it inside. I lived in Maryland for years, and this is the only thing I ever used on my safe, and it came with a Golden Rod. It has never been out of the package in 11 years, and I have never had any kind of a rust issue.
Safecracker