Sheet1 General Arrangement (Version 005)
The main focus for this effort was to get the cab outline, smokebox and chimney drawn in. No complicated thinking required for this, but I hope it makes the drawing look more presentable.
A key finding is that the boiler barrel can be 4 1/2" outside diameter. In copper this is a standard size piece of tube. It allows some space for cork lagging or an airgap, with a thin outer cladding in brass or steel.
For the time being the wheels are not drawn as being quartered. On the front elevation, the two sides of the engine are actually mirrored. Until things are more complete, this is satisfactory.