Well, I wanted to build my own style of engine. So I made the patterns, from real doll house bricks, and casted them from aluminum. The boiler is also hand made. 3" dia, 6 3/4 long with an immersion heater in it. Joints are silver brazed of all brass construction. So far, I have been using commercially available fittings, except for the globe valve. I had that casted from phosphor bronze. The handwheel is of my own design.