I was lucky to have found someone, who had a copy of the SAR&H Durban coal fired Tug plans of the Sir William Hoy, which plans came in the form of lines at 1:48 scale and the plans at 1:96 scale (thanks to Harold in the US for his coping and posting these to me) and local Staples store, who have a A0 copier, which did an excellent job of enlarging the plans to the required 1:48 scale.
This model is 45 inches.

Update 1st October 2014 Now Built and painted as in the Photo, Fittings and Engine casing still to be completed. (Motor: MFA919D Geared 1:6) (7/10)