Aerodynamic bike helmet!

Step 8 Attach the foam/masonite combination to the helmet.

In a stroke of wild luck, since my alignment holes went through all the layers I was able to just run string through the entire assembly and just tie it onto the helmet (those ventilation holes really come in handy). This is another reason why drilling at least two holes in the masonite is a good idea. I added two or three globs of hot glue at the joints where the masonite met the helmet for redundancy. I was pretty paranoid that the assembly would fall off while hotwiring the foam, so as a result it was very sturdy.