The original face has a plastic ring with tabs behind the face. The white plastic on ShapeWays isn't as good of quality as these, and the faces in the original show were more of a gray color, so I'd have to repaint them anyway. I'm also pretty sure that there are ways to prevent chipping during the painting process, like using Matt Varnish after.
Modeling the LNER (and some Thomas stuff) in OO Scale.