In uk.sci.weather on Thu, 5 Jul 2007, Martin Rowley
wrote :
"Graham Easterling" wrote

I also made one from a kit around 30 years ago, and only had to
replace it last year. I completed it an a week or so. It did involve
using half the house to lay out the pieces though.


... not sure if this would give you any ideas, but when I made my own
screen (and another for my sister) a few years back, I used the vents
that are recommended for allowing air to gas installations etc.,
available from any DIY shop. You can get a broad idea of the
construction and use from this view:..

http://freespace.virgin.net/martin.r...%20May2004.jpg

I assume it eventually got a roof!
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)