Swept boss fustration

I'm designing a lounge chair that is semi circular and I'm not having any success using the sweep feature. I've tried to use lofts at each part of the path that changes in curvuature but after adding multiple planes at different angles and using the path as a guide curve it still doesn't come out right. I’ve attached some picture to show what I’m talking about. Any ideas how to get this to work?

SolidworksParts And Features