How to modelise a volume from a surface

Hello CATIA User Community,

I try to modelise an HVAC component and i succeed to create a profil surface ( first picture) , however I have tried with the volume extrusion function ( Generative shape design ) to add a volume but I can't parameter the metal sheet thickness.

Would you know a better function or method to modelise this component ?

Thanks per advance

Best regards

Rémi