Using gun cabinet as humidor?

[craig]

my grandfather has made me a gun cabinet, and the top part is a shelf that is a about 10 inches from the top and over a foot deep. I was curious if you think I'd be able to use that area as a humidor seeing as it's essentially not connected to the gun holding area and they are generally built to seal out (or in this case in) moisture. Would it work?

Anything can be made to work, but it wouldn't be my first choice. Given your grandfather made it, he probably used real wood, and real wood expands with moisture (which is why cheap humidors are made of MDF made to look like wood). Moisture and guns don't really mix well AFAIK.