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This is a slight modification of the 7mm:1ft scale model of the GWR O35 / BR(W) medfit, which I have uploaded on request for it to take sprung buffer units which have a shank 3.1mm in diameter, and to fit a Parkside Dundas chassis, which I am informed is 119.1 mm long. I expect some fettling around the bottom of the side stanchions will be needed to fit over the solebars, and inside the headstocks to take the 'lugs' on the ends of the chassis. Please search for the 7mm DX container which these wagons, of which only 2 were ever built, were designed to carry. I think the DX containers were a lot more numerous, and were carried on 'conflats' and not just the O35's. Until the person who requested it has tried it and given some feedback, I would advise caution before buying it in the more expensive (and brittle) materials. Let me know if you would like to try it in a material that I haven't selected for sale. For more notes about the protoype, see my 2mm:1ft model of the same thing.
MODEL UPDATED 2019-10-23 making the detail a little finer for the larger scale, and incorporating other feedback kindly provided by the first purchaser.