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Repeat and Scale and reshape the extrusions in order to obtain a smooth curve to a point shape in side and top views.



When you need sharper corners use the following method (see images above): select the desired vertices ( B key one or two times) and then in Edit window, change the Weight: button to the desired value (up to 10). After that press Set Weight: button (result at above far right image). To get very stiff corners, select the desired points, Extrude and move them just a little bit.



When you've got the definitve shape, go out Edit mode, Tab key, select the object, then do Alt-C keys to convert the Surface object into a mesh one. Enter Edit mode, Tab, B key to select the lower verts and H key to hide them.



Now in Top view, you can easily select and delete some vertices to make a square shape hole! To reshow the vertices, Alt-H.

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