RE: light colors
The Notek was a regular automotive type bulb, so any white or yellowish would work in scale. I've done it two ways with LEDs, one yellow with no lens and the other a white with a tinted lens. The yellow casts a nice round glow in front of the StuG, but the white with lens looks more realistic to me.
The convoy light was usually portrayed as blue, but recently it was proven to be a satin black tube with green lights.