"I used 2 PVC adapters that looked roughly like minion goggles. I'm not even sure what they're called. I just found them in a bin at the hardware store for $.92 each. Also 1 small machine screw and bolt and the strap off some cheap safety glasses."
"I had to use a Dremel to shave away a bit of the plastic so the bolt and nut would fit. "
"I used some plastic epoxy to glue the pieces together, then the nut and bolt to really secure it."
"I used the Dremel again to shave the goggles to a rough contour of my kid's head and cut slots for the back strap."
Paint 'er up
Just a quick coat of silver spray paint.