you don't need sketch5 and sketch6. Use Loft > to point. See link below:
http://teknigroup.com/Videos/InvDiscussions/loft%20to%20point/loft%20to%20point.html
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Dennis Jeffrey, Autodesk Inventor Certified Expert
Autodesk Manufacturing Implementation Certified Expert.
Instructor/Author/Sr. App Engr. Tel. (260) 399-6615
http://teknigroup.com