Sweeping variable profiles around polyline

Hi,

I'm trying to sweep between 3 types of rectangles on a curve. The rectangular rail is composed of 4 individual polylines that have segments with corresponding values to get the cross section geometry at the perpendicular planes.

All the data lists seem to be properly matched up and the points seem be listed in the correct order, but the script is working only if the polyline is not closed and I am trying to wrap all the way around. Also, in either case the corners are not working.

Hopefully someone knows how to get past this. I've posted the script below and the screenshots hopefully explain where the problem lies.

Thanks for any help!

Derin