The trouble with building a batch is that when you make a mistake, you replicate the mistake for each member of the batch. So, despite passing Saturday morning enjoyably melting tiny pieces of plastic strip into globs that look passably like body bolsters, I now have three flat cars that all sit approximately .030″ (.75mm) too high.
Some analysis with the drawing and a pair of calipers traced the error to several mis-measurements and mis-calculations, each contributing a small amount. Together the small errors add up to a clutch of models that tiptoe on the rails like ballerinas, rather than hunkering in their boots like the lumberjacks they are meant to be.
It’s too bad, because not only do the iron body bolsters look cool, they are also now incorporated into the brakes. Fixing this is going to take some thought.
These cars appear to have had iron body bolsters. Unfortunately, my initial research yielded the design for house cars, and I didn’t realize flat cars had a different design. They look cool, but they’re wrong, and that is one of the reasons the cars are too high. 
On it’s wheels for the first time, this car is too high. Apart from the appearance, the coupler is also too high.
Pembroke:87 
Sorry to hear that. That’s frustrating. I’ve done the same thing,. Thinnking I had the correct reference and finding out it is wrong well into a project. Carried incorrect measurements. Or forgetting to factor in material thicknesses. They do look great. I hope you find an easy solution.
Take Care
Greg
Thanks Greg. It’s all part of the fun, I suppose.
That’s lousy luck. Sorry.
Those trucks look fantastic. Are they your design?
Chris
Thanks Chris. As I go back to the flat car drawing, I am struck by how cavalier I was about the design.
Yes, those are the trucks I had printed at Shapeways some time ago. They are the Canada Atlantic standard pattern, and 3D printing saved the railway with them.
Instead of mucking about fixing them why don’t you just finish them off as the prototypes they are and make a proper batch. Sell the rare and valuable prototypes on early rail if it comes to that.
Hah! Too funny, Andrew. Rare and valuable junk, you mean!