Nice to see another Mark here, way too many Dimitri's here for a while there. Just thought i would mention what i did with the roof lining. Clark Rubber sell Acoustic Foam. Although it is slightly thicker it still fits. I grabbed a piece 1/2 a lineal meter and same of new vinyl. Good part is with the Acoustic foam is it has a backing that is (you guessed it) Adhesive.
So you can gut the template with the vinyl, lay it on the acoustic foam with the old Kwik Grip (mum always called it kiwi grip) on both sides which leaves the mess outside the Zed cabin (it's a small space to work in so take out the seats). Then mark the centre with chalk Mark and centre of the roof. Peel backing off and fit it up with a plastic plastic trowel on the ends. Just another way of doing it and fresh vinyl is awesome.