3D Duct Offset

Hello,

I'm trying to draw a 3D duct offset, as the title suggests.  I have the 3D sketch, (see attached), and after much time and research, still can't get it to extrude/fill/actualize into the 16GA duct I need. 

Also, is there a way to transform this sketch directly into a "hollow duct", with the small ends open, or must I totally fill it and then transform using sheet metal?

Please advise.

Thank you for your time!

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