As far as the light bar, depending on what you have in the parts box, I would find lights that would do the job and those can be found in car kit, especially old hot rods or ask here on the forum and someone might have some for you.Once you find the lights you can make the frame with some 1/16" diameter solder. you roll a piece of it between two pieces of wood to make it straight, polish it with some toothpaste to give it some shine, roll it again, and then with small needelnose pliers you bend your frame to the shape you need. CA glue loves solder so gluing it to the truck is pretty easy. If you think that solder might be too soft, you get the flux core solder and run a piece of crafters wire thru the center if it (where the flux is) all you have to do to push the wire in is run it over a candle (just the wire, not the solder)and it does'nt take a lot of heat to melt the flux.
Hope this helps
Later
Dan