BAS make the roofs themselves.
They supply many UK fitters. any of these fitters charge a premium to fit.
Go to BAS direct and you will get the same roof, direct from manufacturer, at a lower price.
They have people driving from all over to get fitted by them
They will even drive you into town so you can go shopping whilst the fit (took about 3.5 hours) - lots of shops and food to eat. or a cinema
Products » Car hoods » Select your Cabriolet » Porsche Hoods » Porsche Boxster Glass window upgrade Supply and fit - BAS International