Sills are composed (generally) of an inner and an outer, sometimes with an additional strengthener inside.
All are structural - that's why you fail the MOT test for having rust holes in the outer sill.
As far as I'm aware the C3 doesn't have any kind of plastic sill trim cover or side skirt - so the damage you are looking at is to the metal sill itself and therefore structural.
All are structural - that's why you fail the MOT test for having rust holes in the outer sill.
As far as I'm aware the C3 doesn't have any kind of plastic sill trim cover or side skirt - so the damage you are looking at is to the metal sill itself and therefore structural.