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I am going to make my own screen soon, but my plan is to build a removable one. The idea is to use a wall panel that can be hung in place and moved if required. In my case the wall is stone and brick (an old cow shed with vaulted ceilings in a farmhouse) and so painting is not a solution. Given that the materials we have used in the renovation are all natural (the less natural one being lime), we have some experience with the quality of the whiles given by lime based paint, if we can call it paint. Lime white is very pure, the only problem I see is that the finished surface is very sensitive to the method of application. Given that a panel has two surfaces I think I will just try with two methods for the two different surfaces. Note that one of the best lime renders for interior you can buy costs about 40 euros (discounted price on internet) and that's for 15kg, which cover a huge surface, in particular if that's white to start with! A comment about the grey screens you mention in the article. What I read makes sense only if you have a lot of ambient light, as the grey screen lets you pump out the max output from the projector without blinding you and effectively being equivalent to less ambient light. But in absence of ambient light if the screen is dead neutral grey, it should be absolutely equivalent to a white screen with a lower projector output. So, for instance, the colours should appear very similar. Any change in saturation means a non neutral grey. The comparison with mixing grey and a colour does not hold, as this would be subtractive while in the case of the projector is additive.
Viewsonic