Tutorial - Modeling Lamp shade in SolidWorks method 1?

Here is the tutorial.
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Step 1:
Top plane >> Sketch.
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Step 2:
Draw a circumscribed polygon of 100mm diameter.
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Step 3:
Exit the sketch. Reference Geometry >> Plane.
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Step 4:
Offset the top plane by 80mm.
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Step 5:
Plane1>>Sketch.
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Step 6:
Draw a circle of 50mm dia.
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Step 7:
Select Lofted surface tool under surfaces tab and select both profiles.
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Step 8:
Planar surface tool under surfaces tab.
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Step 9:
Select the upper circular edges.
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Step 10:
Front plane >> Sketch.
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Step 11:
Draw a line.
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Step 12:
Exit the sketch and then Curves >> Project curve.
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Step 13:
Select the line and the face.
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Step 14:
Top surface >> Sketch.
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Step 15:
Draw this entity using rectangle and then fit spline tool.
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Step 16:
Exit the sketch and then Select Swept surface tool under surfaces tab.
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Step 17:
Select the spline as the profile and curve as the path.
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Step 18:
Reference Geometry >> Axis.
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Step 19:
Select Top plane and Origin.
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Step 20:
Circular pattern.
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Step 21:
Select the swept surface as the body to be patterned about axis 6 times.
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Step 22:
Trim surface tool under surfaces tab.
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Step 23:
Trim type be mutual and select all surfaces to trim. Under remove selection select all outer surfaces with swept surfaces.
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Step 24:
Click OK and the trim is performed.
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Step 25:
Thicken tool under surfaces tab and select the surface. Thicken it inside.
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Step 26:
Top face>>Sketch.
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Step 27:
Draw a circle of 20mm diameter.
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Step 28:
Extrude cut it by through all.
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Step 29:
Insert >> Feature >> Flex.
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Step 30:
Select the body as flex input and then twisting type flex. Adjust the tried to X=90.Y=Z=0. Now input the flex angle as 90º.
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Step 31:
Click OK and the part is generated.