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Get an old computer LCD screen, disassemble. Inside you will find a few matt surfaced plastic screens ( light spreaders ) that are perfectly flat and make excellent back projection screens. I've been playing with one for a transit scope idea and it works a treat.
Not sure how big you want it but plenty of 15"-17" screens being chucked as people upsize and I got a 19" where the cold cathode tube had failed. Wasn't worth the cost of repair at work so out it went.
I know there are at least three of them out on the rubbish trolley at work right now.
EDIT: Just read the instructions and the stuff they are using is a flexible material. So you might have to cut a circle of LCD plastic to make it similar to theirs. Same result. Edge duct tape it on with the magic go fast hold anything stuff. I love DIY
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