Do It Ourselves: back lit projection screens

This is a quick mock-up of what I'm thinking for showing the films.  If possible, the projectors will be placed behind the screens near the glass of the storefront.  But if that doesn't work, then we can place them on shelves we've mounted on the back wall.

And here's a quick DIY video from Zack, the friendly YouTube man, on how to make a screen cheaply.  I'm betting the farm it's easier, faster, and cheaper than it looks.  Plus, I figure it'll make me lose ten pounds without asking me to sacrifice any of the foods I love.