HELP !!!!

 From:  Frenchy Pilou (PILOU)
Maybe like this : Select the curves lines as path : Join / Offset / Select the form Sweep with 2 rails
else you must place the form with rotation at each angle and make a Loft straight
or better trace the internal straigth line for replace the Offset function if you have an complex path inclined or other ;)

here with the first method :) file 3dm linked
Is beautiful that please without concept!
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EDITED: 24 Oct 2007 by PILOU