Re: D&H Flat
Yes, here are the ones that are, in my opinion, close to the prototypes we're discussing.
The car body casting --
The trucks --
On both of those pages, the prototype car is shown.
I don't immediately see the other one, but Shapeways' filtering capabilities aren't fabulous. And I don't have it here any more, it went to my other house.
I will say that there are at least a few freight cars and parts for our era on the site. I have not built one yet.