Hit a slight problem in that when the roof was on and tensioned the roof had risen from the metal roof, especially at the corners. Luckily i contacted RS Coachworks (webasto specialists) and they suggested that the locking bar might have suck slightly over time, and i could try a few strips of wood to tray and curve/bow the roof more
It worked! the roof is now sitting really well
Just a few bits to do to the outer skin before i can fully fit it. There are several slits the roof bars slide into and some straps to help it fold when pulled back.