Looper Blunderbuss and Display Box

I've seen a couple wonderful blunderbuss threads on here, and being a big fan of Looper, am going to start my own build. But when I saw the movie, I saw the box he throws the blunderbuss in, it seems easy to build, and it'd be a cool way to display it.
The sign in the trailer and the sign in the movie are different, for some reason.
Trailer


Movie


So I threw together this quick sign. Printer paper. Paint. Nothing special.

I'll be going to Home Depot in the next few days to get some plexiglass for the box.