GoPro handsfree set 2

There are millions of clips on youtube where someone is showing something with one hand while holding his camera in the other. That's not handy! But if you put your camera somewhere else, you can't see what it is filming. So I thought it would be handy to be able to look through the camera so that you can see what you are filming while having both hands free.
Inspired by the Google cartboard VR kit I made this.
I don't own a GoPro but have a SJ4000 camera. But it should also fit a GoPro I