Just a quick update on my 3D-modelling efforts. For the last couple of days, I have played around with CoCreate Modelling Personal Edition and have tried to create my first virtual model. I tested it with the easiest part, the Diamond Stack of the Shay.

 
It should fit the base of the smoke stack on the body of the Atlas Shay … unless I did not measure it correctlyof course … 
The shape has been based on the Diamond Stack of the Joe Works “Class A”  Shay, but it could be that I have to adjust it later on to fit the spark arrestor. Yesterday I uploaded the STL-file of the model to the site of Printapart.com and placed an order with them. Curious to see what will be delivered to my house one of these weeks!