Howdy, I am currently working on this engine. I bought the parts through an on line auction and unfortunately a lot of the castings were missing. I had the flywheel, the cylinder and steam chest, the base on which to mount it, the beam, and the two gears along with the two brass balls for the governor. I had to make all but one on the of the bearing stands. Everything else was made with aluminum and brass. I have had it running on about 8psi but it still needs a lot of work. I am an amateur at machining so it has taken over a year so far with a few parts having to be redone. I have tried sandblasting the aluminum to make it look like casting and it's not too bad. I too have wondered if this could be build from raw material. Probably the flywheel would be the most difficult. I have already made a large cylinder and steam chest from aluminum and it looks not too bad, but not exactly like the original. I am a member of the Hamilton Ontario Model Engineering Club and one of our members has a foundry. He was telling me he might try and make the castings similar to the Stuart castings. I have made several stationary steam engines using brass and aluminum and they look ok. I must admit I am having a devil of a time working on cast and going through a lot of cutting tools. I suppose its just part of the learning process.