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2D polyline to 3D surface


Good day
I am a beginner in AutoCad and really struggle with the attached drawing.
I have managed to make the bottom profile a solid but I just cannot manage to convert the top polyline to a surface.
My goal is to use the loft tool to create a solid profile changing from the bottom shape to the top shape 2800mm path in Z axis.
I created the top polyline from the bottom polyline I just flattend the two sides by rotating and drawing four new lines.

A step by step explanation of what I am doing wrong will be highly appreciated please.
My steps were,
Join the lines and archs to create a polyline, result were 44 lines joined
Pedit width of polyline to 0.3
Then tried to convert without success

Thank you