Stick a gone hunting sign on the door every time you leave, and get some gun paraphenalia (but not a gun) visible near the door. For extra points, time delay a loud pre-recorded bang and scream from a distant speaker when motion is detected near the door.
As soon as someone see there's no gun case, the charade is up.
My grandfather was an avid fisherman; he had a 15' line full of catfish "skulls" hanging from a telephone pole. Catfish can grow to 100 lbs. and their "skulls" look like shark or snake heads from a distance.
Macabre trophies do the trick, paraphernalia alone seems an obvious attempt to appear tough.
