Just a note to anyone thinking of putting a ply roof lining and fibre glass in there van, use at least 8mm ply. I tried 3mm (I think) and it looked s**t as it bellied down in between the roof supports and I had to remove it and replace with thicker ply even the 8mm is just say thick enough and you need at least 3 pairs of hands to fit it.
Stu.