Thanks! The body is only blue because every shape has different colors, and when you combine them, they turn into that color. I think when it's uploaded to ShapeWays it just turns into that translucent white (for the Smooth Detail Plastic). And last night, I worked on it a little bit more and was able to get the windows cut out. I'm not sure that I could resize it to N Scale without having problems with the cab thickness. As far as Gauge 1, I might still use plasticard for that because it's easier to file and adjust it when it's a really big piece.
Modeling the LNER (and some Thomas stuff) in OO Scale.