CBH won't release plans for the wagons, I've asked before. I even had a few friends who work for them, and they can't get even an outline drawing of them. If someone can, that would be great.
So the photo's are all I have to go on. During a visit to Albany in the south of WA, they come in on the station line and you can get close enough to touch them.
They are 14.5m long, so here is your baseline. When they were stopped waiting to enter the siding, I took enough photo's to see me through to building them.
I also saw where they sat in relation to the station platform, so when they moved, I had a good idea where the height of them were and measured that.
I did talk to a person at the Perth show that gave me some information, as he works for CBH. Yes they are in pairs, but the first lot are not in running numbers.
When they got them, they took all of them by truck from the port to the assembly area and put them together. However, they were putting them in pairs as they were coming in, so no sequence to it.
So you might see wagons 001 and 006 together, and 003 and 018 together in numbers for example. Whereas usually it would be 001 & 002, 003 & 004, etc.
When the later ones came in, they paired up their numbers better. They are trying to maneuver the early wagons to match them up as they get time.
Also the pairs have 1 even and 1 odd number I was told. The even number is the one without the CBH Group name on and has most of the braking system. How correct it is I don't know.
I have almost 50 running numbers with their correct check letters at the end which I am using for my decals. I'm trying to get as many as I can and do different numbers for every wagon I do.