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The OP seems to have gone quiet. I suspect because there is no such thing as a free set of drawings available on the Web to 3D print a Ploughing engine.I would start with a basic Farmer's traction engine rather than the complexities of a steam Plough. Try accessing "Scale model traction engine building, featuring "Minnie" available from the internet archive: https://archive.org/details/scalemodeltracti0000maso/page/n235/mode/2upJo