This is ask too much, but this is a perfect example of a modelled NS 6400 (by Christrains) here you can see the ventilator that I meant and maybe you can use this to add some little more detail:
Remember It’s your loc, you decide when it’s ready or not.
http://www.christrains.com/images/product_ns6400.jpg
here another great example:
http://www.amazingmike.nl/img/payware/TRS-NS6400.jpg
You also see the squared texture on front (and back offcourse)? It’s a small detail that changes much, just like the squares on the sides of the cabin, they don’t draw much attention but they significantly complete the model in detail.
