BR diagram 1/110 21t rivetted minerals in 3mm:1ft

This is a scale-up of my 2mm model of the BR rivetted 21t mineral, with a little attention to the profile of the stanchions for the benefit of the larger scale. I understand that members of the 3mm Society have acess to a 12' WB chassis kit which should be suitable for these wagons. The end doors being separate parts probably add a little to the price, so let me know if you don't want the freedom to swap the doors around (for example, with the 16t minerals) and I'll load up a version where the bodies are one-piece.
To avoid the potential problem of the sides bowing during post production processing, I have included bracing inside the wagon. The bracing has been designed a little thinner at the joins with the sides, and by scratching carefully here with a sharp scalpel they should then break out when flexed. A trace of roughness along the break lines, which are behind the stanchions, should be no bad thing.  
You will need bufferbeams as well as chassis to complete these models.
However, I have also uploaded the same wagons as single models, with fixed doors, and including bufferbeams.