You can get Mylar from any astronomy shop, or hiking store :)Mylar relfects 96% of all the energy (light, heat, ..), that's why they use it to keep someone warm or to observe the sun.You can also use Baader foil, wich has a reflectivnes of 99.999%, but is a bit more expensive. Both can be obtained easely in large sizes and it's not so expensive.

Hmm, thanks for all the info.I've just been measuring up in my "Beechhouse"I have 65" from the nose to the base of the windscreen.The vertical height of the windscreen is 16"But the problem I have is the apex roof, I only have 34" from the base of the windscreen up to the apex , worse still only 25" to the roof from the outer edges of the windscreen.I could of course have the screen slightly further forward and therefore get more depth because the nose slopes downwards.The screen width I want is 62"(thats windscreen width plus 3 " either side) So I'm gonna end up losing a lot from the height of my image, about 18" to 22" in fact.Now my thoughts are, well you can only see so much thru a Queenairs screens, so maybe it's ok to lose the top and bottom of the image so long as I get the thing in the right place centrally.Is my logic flawed ? I'm trying to avoid seeing the interior of my building thru the sides of the windscreens. I wish that I had a taller building but I don't right now, so what are everybodys thoughts?