At this scale tiny boxen tend to look pretty bad because you have so many angles you could get slightly wrong, so in order to make the sign, I laminated several pieces of heavy card and sandwiched the Ghostbusters logo inside some frame pieces. Then I cut the outer edge all at once. It's a solid thing rather than a hollow box.
One very nice touch from the designer: the detailing pieces function as tabs on the outside of the model -- I thought that was pretty clever.
Also, the cornice details pull the 45 degree mitred edges together very nicely so there's no gap.
Hopefully some kids will recognize it. I donno, do kids even watch Ghostbusters any more?