If it helps I belong to quite a few NZ train related groups on facebook that may quite possibly be able to provide technical drawings and blueprints for any trains over here. I’m going to be really busy for the next two weeks, but I should be free enough after then to see what I can find if you would like?
That would be awesome and very much appreciated if you manage to find something.
For the dump doors I found an article of the CB wagon derailed on a collapsed over-pass in Australia, looks quite dramatic. Which led me to some more derailment pictures of the clean up and from it luckily 1 wagon has the dump doors open so I managed to figure it out.
I’ve also figured out the subtleties between DC.. , DF.. & DX.. class so I’ve continued a little on that now as well.