This Stuart no. 9 engine was built from castings. I bought the castings shortly after buying a Drummond M type lathe and expected to quickly learn to use my lathe and build the steam engine.
Unfortunately for the engine and fortunately for me I found that I needed lots of attachments for my lathe such as ball turning attachments etc. in order to make a good job of the engine. Thus this engine formed a self instruction project that also fully equipped my lathe with all the thinks that a model engineer needs.
I still have to finish the steam feed and exhaust pipework as I feel that a proper scale pipe with bolted flanges would be more in keeping with full size practice.
The Stuart castings were superb, and I bought the book "Building the Stuart No. 9" by Tubal Cain.
I am now considering my next engine - which shall probably be either a beam engine, a table engine or a vertical engine. All that depends on finding time in between building tools.

STEAM ENGINE
A Stuart No. 9 Mill Engine