Tutorial - Making iPhone 4s in SolidWorks Part 4?

Here is the fourth part.
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Step 1:
Split line and project them on back face.
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Step 2:
Inner face >> Sketch.
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Step 3:
Convert the inner edge and extrude cut it by 0.50mm.
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Step 4:
Dome it by 0.4mm.
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Step 5:
Circular face >> Sketch.
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Step 6:
Convert the edge.
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Step 7:
Extrude it by .10mm and uncheck Merge result.
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Step 8:
Bottom face >> Sketch.
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Step 9:
Draw a slot.
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Step 10:
Mirror it about a center line on origin.
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Step 11:
Extrude cut by 1mm.
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Step 12:
Left face >> Sketch.
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Step 13:
Draw this slot.
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Step 14:
Split line and then select inner face.
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Step 15:
Bottom face >> Sketch.
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Step 16:
Draw a rectangle.
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Step 17:
Extrude cut by 2.5mm.
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Step 18:
Chamfer the cut edge by 0.15mm at 45º.
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Step 19:
Bottom face >> Sketch.
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Step 20:
Draw two circles.
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Step 21:
Split line and select bottom face.
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Step 22:
Circular face >> Sketch.
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Step 23:
Draw a 5 side polygon and construct star.
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Step 24:
Repeat same step for other circular face. Make polygon construction.
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Step 25:
Extrude cut by 0.50mm.
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Step 26:
Here is fifth part.
http://grabcad.com/questions/tutorial-making-iphone-4s-in-solidworks-part-5