Hi Overdrive
Many thanks for the long and thoughtful reply.
I suspect that I have been lucky with my roof material and window so far since both are in decent condition, especially for 10 years (I bought the Boxster about 8 months ago). I would be quite happy to retain the roof if the window was not damaged. Out of interest, with regard beading water, did you try one of the waterproofing sprays on your roof? I had very good results from the 303 products.
With regards wind noise with the hood down, I have the plastic inserts in the wind deflectors. They helped a little. With the hood up I have just installed the PNP rear speaker kit, and this makes a huge difference to sound quality from the original sound system. Still, my wife manages gto talk over both.
Regards from Perth
Derek