I saw a photo of a green twin oscillating steam engine on the Preston Services website a few years ago, and a Canadian buddy of mine challenged me to make one.
Long story short, I built a foundry, used a 3D modeling program to model the engine using 3 photos, made the patterns, and cast the parts for a 60% scale engine.
I recently got the engine running, and it can be viewed here:
The plan at this point is to finish the painting work on the engine, and publish it in Live Steam and Outdoor Railroading magazine.
It was a long journey to learn the foundry work, but I was able to cast some of the parts in gray iron, with the remainder being cast in 356 aluminum.