Nice work Alex, I love stuff like this. I have a suggestion for your next such conversion.
Pick up some of the flickering tea lights at your local Dollar store, they have the flickering LED and a CR2032 battery. You can use that LED as the lighting for the firebox glow, then you get a flickering fire in there. I got the last batch for three for a dollar. I did that in my cab forward conversion, it gives you an interesting effect. I had to drill through almost 1/2" of diecast material, so the led just setting in the hole gave interesting reflections off the side of the hole for the firebox. You just need a diode, resistor, and a filter capacitor, and you can power it from track voltage.
