Hi Ken,
Welcome to Shapeways!
Regarding your railroad model, if the original plastic kit is copyright/design right(ed) and the owner active, you may have issues IF you sell the model, you'd be ok if you were having it made for your own personal use though (and to be sure it might be worth doing some digging and asking someone in the legal field of copyright law)
As for scanning in 2D drawings to make a 3D model, yes that should be possible with the right software, but alas, I don't know which.
My method would be to scan in and convert to a 2D dxf file, then to arrange the various 2D files in a 3D program to create a shell of the model. My method would invlove a lot of manual work tidying things up.
Any other fellow Shapies have any input to help Ken out?
Paul
Last edited: Jul 11, 2011