The kick panel is just 3 layers of mat & resin. The curvy shape is very rigid and holds it's shape very well.
Sounds like you are stuck on the concept of the cardboard headliner insert which is a relatively new development. I don't know what model car you have but any competent upholsterer can install a sewn cloth headliner in older cars that don't have the cardboard insert. IMHO, the old style sewn type is much better looking than the glue-in type; says 'quality' rather than 'cheap to build'.