David, I'm not sure if there ARE any tricks involved... For the snow shields I printed out a couple photos and guesstimated the size, cut them out of .005 brass and bent them to shape, cut the attachment straps and bent them, ACC'd them to the bottom of the shield. Trim for height, paint, glue to the roof. Horn mount cut a brass strip, drilled a mounting hole and reused the horn set. Ditch lights used smallest evergreen tube cut very thin and enlarged hole to fit 0603 LED, glued to flat stock to form bracket, glued in 0603 Sunny white LED, drilled through body at correct location, routed wires to avoid nose piece (which holds coupler), tacked them down with glue, glued lights in appropriate place, soldered to F1 pads on (Digitrax) decoder (LEDs wired in parallel, no resistor needed). I put some Kapton tape across the top of the decoder just in case...gently put shell back on body being careful to not pinch the wires, and done. Took a bit of time, mainly waiting for glue and paint to dry. But the locos now look better and more prototypical IMO. Pretty happy with the results!