I aquired some cheap Atlas O gauge wagons, with a thought to converting them into 16mm wagons. The more I look at them I think the work needed to make them look the part probably exceeds the effort of scratch building. I did wonder about using slightly larger bogies, or even cutting them down in length. As they stand at the moment they have more of a mine tub feel to them (albeit a very long one).
Please feel free to suggest possible plans of action.
In scale they are about 4ft wide by 22ft long.
