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If you want a better looking Google VR headset use foam core board instead of cardboard to fold the foam core board you need to cut a v cutout at the fold line but do not cut all the way through. You can find black and white foam core @ Dollar Tree for $1.00. Just remember If you want to paint it another color spray paint is not recommended because it will eat the foam but you can use water-based paints with no problem like Acrylics. You could paper mache the cardboard then paint it but don't forget that you have to make the front where the phone goes in can open and close. The foam core will be lighter than the paper mache.
If you want less vibration use Counterweights to balance it out ..
Halloween Skeleton Made of Plastic Shopping Bags.