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I don't know if it's any use but here's a photo of the model P T Dromedary in the science museum. I don't really know how accurate the model is but the tow hook looks quite small on this model and is somewhat lower than the centre of the 'hoops'...
Hi Stuart. In (I think the 1960s or early 70s) MODEL BOATS did a long series called Towage on the Thames which featured Anglia with a scale drawing and several other early paddle tugs, all with almost A4 size plans. Regards, Walter.