OK Stan, thanks!
So here is a snip of the simple circuit, and a 3D view of the board for reference.
Gerber files attached below. The BOM is pretty simple, you can take it off the schematic easily. If any help needed just let me know. The only somewhat unusual components are the two 1N5257B 33V Zener diodes, but there are sources on ebay, and Digikey has them in stock I recall.
This board can easily be mounted on a spare two axle truck as Stan had done, or it can be installed in the roof of a suitable "MOW" type car with only the LED's showing above. One car that it looks like it should work well on is an MTH Jordan Spreader, which has a nice flat cab roof behind the cuplola. But there are lots of other good choices out there I am sure. Instead of the 2 pin Dupont header shown, you can simply hard wire it in of course. 
Rod
