AutoCAD Inventor :: Loft And Thicken Results In Broken Surface

I am having problems creating a profile around a path. The profile (image-1) resulted in an undesirable corner (image-2).  Which I don't know if that can be fixed.  My workaround was to create a lower profile, and then loft between the 2 rails.

The loft results in a twisted surface (image-3).  So to correct this under loft> transition I turn off automatic mapping and edit the point set.  I always end up with one extra set of points, or edge, and end up having one set of points on top of another, a duplicate edge.  Which I believe is where my problem lies.  However I can not delete this extra point set, so there is not much I can do there. Am I missing something?  This results in a surface loft (image-4).  When I thicken this surface by 6mm it results in this broken solid (image-5)

I have tried merging tangent surfaces in the loft command, which appears to work better, but when using thicken the error message reads that the thicken operation did not produce a meaningful result.  When I change the thicken direction I get a solid, just not the one that I need.

I had many other strange errors, and seemed to have solved some of them by taking the fillets out the sketch, and applying them to the solid.  But this should be an easy operation, and I can't seem to make this work at all.

I am using Inventor 2014 and the ipt file is attached.