Step 2: Paper Mache
Map out where the visor should be and cut it out with an exacto knife
Next, cover the whole cardboard structure with paper mache. I used a simple recipe of Elmer's wood glue thinned with just enough water to make it easily spreadable. For the paper I used newsprint.
Around 3 or 4 layers should suffice, allowing it to fully dry between. Make sure not to trap any air between the layers.