My father bought castings for this engine at a garage sale when I was a small boy. Model Dockyard was a hobby supplier in Swanson St, Melbourne, and through the Australian Model Engineer magazine I was able to locate original blueprints. Recently (50 years later), I finished it for Dad, then added a boiler and electric generator.
(Click images for a larger view)
This is the vapourising burner, of my own design, burning methylated spirits.
And here are the components of the burner. The chicken-feeder design ensures that the output stays constant as the metho is burnt.