Depending on your climate, you might not need to worry about moisture control. I have needed none in western South Dakota, Anchorage and western Montana.
Thanks for the response Daryl. I'm in southern Ontario. Fairly humid and having been raised on the Canadian prairies, I can attest that it is much more humid than South Dakota or Montana. I keep a light bulb, golden rod and silica in my other safe.
Because the safe has no interior lining at all, I want to put something in like wood panels to protect the guns from the occasional bump. Just wondering if I needed to back the wood with anything to avoid creating a moisture absorbent lining.