I just finished scratch building a 1:20.3 D&RGW 6200 series flat car using Shapeways castings for the draft gear, bolsters and stake pockets. What beautiful pieces they make. Get on their web-site and check out all the model railroad items they have available. They were also not very expensive.
No pics or it didn’t happen!
Like he said, go to the web site:
http://www.shapeways.com/miniatures/model-trains?li=nav
OK, I made it easy. 
Greg
I’m gonna plug an old line supplier. Ozark Miniatures. Metal parts, at a better price point. Great guy to do business with.