I have just started on No. 4 model since Covid19 decided to keep me mostly at home. It will be my interpretation of what the engine room and paddle wheel may have looked on the ferry boat General Gordon. The prototype was built in my town, Terrigal, around 1868 and used on the Hawkesbury River just north of Sydney. To get the proportions looking right between the paddle width and the hull I have had to offset the crosshead slide block. It looks a bit strange but I couldn't see any other way.
The cylinders are started having machined the cylinder itself and the valve block, both in cast iron.
Robert