Awesome, I'm going to try making this shield/fairing this weekend.
I'm thinking of starting with a 15" x 15" sheet of white polycarbonate (1/8" thick) from TAP Plastics. Saw and sand by hand, bend with a heat gun. The sheet is a little more expensive than the garbage bin ($14) but I think it will work out to be more rigid and solid.
Will let you know how it goes.