[mcguyver]

Go buy a replacement faceshield from anyplace that sells safety supplies. All you need is a pair of scissors and something to heat the material to bend it, like a microtorch or even a lighter.

Build a form out of thin cardboard or thick paper, like the stuff from gift boxes. Then, once you get the shape just right, trace it onto the poycarbonate, cut it and heat the sides to bend it into shape. Works like a hot damn, you can make a dozen shields for about $5, and they can take quite a beating. I use them to protect real Eotechs, they have taken strikes and been bashed up against branches, etc.