Hmooslechner:
1. Draw an Arc for one part of the double curve (sine wave). Rotate this Arc so the radius of its midpoint is horizontal.
2. Rotate a copy of this Arc around the endpoint of the original Arc. These two Arcs will be tangent to each other (a Line draw from one Arc center-point to the other Arc's center-point will pass through the endpoint connection of both Arcs, as per my earlier illustration).
3. Drag a copy of the two Arcs horizontally the thickness of the cladding.
4. Select these 4 Arcs and Multiply them the height of the Wall.
5. Draw lines at the top and the bottom of the Arc shapes to connect them (so the two undulating Arc shapes have a boundary.
6. Magic Wand the Fill for the cladding inside this bounded shape.
7. Save Profile.
David