That drawing is pure splines, Those cannot be extruded, I tried loading a dxf into bobcad and it wouldnt take it. maybe solidworks can do it, but who knows. what you want to do is make a drawing with polylines, join them and extrude,
as sad as it sounds, that will need to be redrawn in lines and polylines to make it 3d. try drawing the center with arcs.
Jon
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