O-scale fire alarm box
Not large or spectacular, but I think it turned out well considering the size.
Vintage fire alarm box (still in use in some areas).
This is only a couple of inches tall. O scale comes out to about 6.08 mm per real-life foot. Miniature LED on top. The original boxes usually did not have a light on top, but had a red or orange light on a nearby taller light pole. I took some liberty in design here. 🙂