I am scratch building an HOn30 version of Railcar #12. I did not build the larger model, I own it but did not build it. I had a hard time finding Railcar Photos and I could find no drawings. I was given a lead on a book that is suppose to have some drawings in it. I ordered the book from a UK book shop but have not gotten it yet.
You can look at the model of the #12 Car and find a few like it on the Google picture page. The large model runs on 16.5mm track and the small model runs on 9mm track. The small model is my version of an HOn30 model. It will use a Japanese N Scale power truck.
Quite interested in this build. I note you are using the KATO chassis. I have one one of those and the gearing is such that my models run quite fast. I wonder if there is a way to slow them down without causing problematic performance?
____________________ Rod Hutchinson