Since the one I have is not a mint OE engine, I think it would look neat with some lighting. Anyone ever try that?
Yes, about 45 years ago.
Drilled 1/8 inch holes in all four dummy lights, painted the reflectors silver, and put a grain of wheat bulb in each one.
Regarding your fire car: I would not be surprized if your fire car started running poorly after a while.
In my experience, once a brush is contaminated with oil, it is ruined. Cleaning the brush seems to only remove surface oil. After a while, oil that is embedded deeper into the brush comes to the surface, and fouls it.
I always replace oily brushes.