Here is my boot floor, if you have looked at my thread you will see it was chopped up and modified to give a flat floor. The quality of my "sticking n gluen" is trully appalling and it looks like the surface of the moon. I knocked of the worse bits with an angle grinder and the van lining has hidden the rest. Would work perfectly for the roof lining.
Vey easy to fit, took 15 minutes. Used a trim spray glue on the panel and the back of the lining, it has quite a bit of stretch for the corners.
I'm intending to paint the inside edge of the boot lit and use the lining material on the rough centre section.
In fact the way my paint preparation is going I might cover the whole car in it!