pvc panels

Hi all, I have recently purchased a holiday chalet that has PVC external walls under the windows. Think very wide PVC door with a solid panel bottom halves. I am wanting to build a timber framed false wall on the inside as I am having all the internal walls reskimmed. The false wall will be...

What's best behind pvc wall panels? Was thinking of standard plasterboard with a skim and mist coat, but there may be better/quicker options eg. Knauf Aquaboard primed with something?