@Anonymous wrote:
Here's sketch1
Excellent!
It looks like you discovered the Centerpoint Rectangle tool and the Projected Origin Centerpoint.
Model all of your parts making use of geometric symmetry (if it exists) about the Origin Center Point and you will have better sketches, fewer workplanes and often fewer features.
For the Shell select all of the faces you want to remove - any remaining unselected faces will be offset by the thickness you choose.
Basically what you are doing is Delete Face and Thicken (two separate commands in Inventor) in one operation with the Shell command. So concentrate on the faces you want remaining to Thicken. For practice you might use the Delete Face and Thicken rather than Shell and then Shell will make more logical sense. There are some additional benefits to Shell once you understand the command (like multiple face thicknesses - expand the dialog box).
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