Marshall boiler drawing
 

Has someone out there got a boiler drawing for a 6nhp Marshall single cylinder traction engine?
My engine was built in 1903 and shipped to Tasmania where in 1919 a complete new boiler was made by Glasgow Engineering they made the firebox 6 inches longer than the original colonial fire box which made a rather odd looking engine, i want to make a new colonial boiler as Marshalls designed.
The colonial boiler i think i am right in saying has the firebox just one stay longer i do have a standard 6nhp boiler to copy but a drawing would be very useful. Many thanks.

The drawing number is 21984 acording to the build sheet.