Does your wife like to pull your leg?
I know that there are some safes which have wood interiors, very fancy at that, and I can imagine someone building a furniture enclosure for a steel safe, but an actual safe made entirely of wood? I wouldn't trust that to prevent burglary or fire damage.
I'd shoot back with a couch safe like they sell at bedgunsafe.com

After all, you never know when you might need bullet proof couch cusions!