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Create the shell
In project Schematic, double click on Geometry to open the Design Modeler. When prompted, select Milimeter as the unit.
Click on the XY Plane and the z axis to begin sketching. Use the line Linetool to create a vertical line from the x axis. Hover the cursor around the axis until you see a symbol C to begin your sketch. The symbol C means the line is coincident to the x axis.