We're about halfway through the process and this is what you should have so far.
In the Top View create now a thin Box with 10 Length segments, between the two thick lines.
Convert it to an editable polygon or add an Edit Poly modifier and go into Vertex mode (shortcut: "1"). Next, select the vertices in the left end and rotate them to match the top part of the straight line (which is purple in the image above).
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