I've just completed a retro fit, multi-format conversion, to my 7ft Owl 4:3 electric projector screen. A video of the screen working is available at http://www.4tn.net/homecinema/ Cost of the conversion was under 20 GBP. I need to iron out a couple of difficulties and find a more suitable material before I post instructions. For this conversion I used black felt. I need a better masking material that is more dimensionally stable if anyone has a suggestion.