A medium size gun safe hidden behind a mirror or built-in shelving might be the best solution. Looking for a space that will accommodate a x x gun safe so it probably needs to be a few inches bigger than those dimensions. Would need 110 VAC outlet also.
Here is a method of creating a cabinet. In particular a gun cabinet. This method can be used for other things, such as a bench, which is the time-lapse video. All wood was recycled, only screws and hinges were bought. Documentation gets a little sketchy t
how to make a secret door a room or closet. I think we'll figure out how to do this for double doors. I have double doors between my sew/craft room and what will be the dining room. more storage in what would have been lost space .
DIY Burlap Baskets using Plastic Dollar Store Bins (2018)