The wagon design was scaled up from some 7mm salt wagons I had built over ten years ago and which were in turn based on a WHR narrow gauge wagon.
I used various thicknesses of plastic card to build the body with blue masking tape for the felt roof. The wagon bases are second hand HO-OO oil wagons which although they have slightly smaller wheels than proper this does not show up too much as most of the lower model is hidden.
Detailing was done with even more plastic card and plastic rod for the rivets. The brake levers were cut from a single piece of plastic card and slightly bent to fit the model.
I'll post detailed of how the two models were painted soon.