Topic: Planning on streaming Virtual Boy in 3d

I heard you can buy 2 virtual taps (devices to mid a VB to display on either HDMI or VGA screen) and attach them to each eye.

What do you guys think about this way of making a 3D display of the play.

1. Put the left eye in black and red.
2. Put the right eye in black and cyan.
3. Get 3 sets of VGA to BNC breakout cables.
4. Hook the csync, hsync, and red of the left eye, and the green and blue of the right eye.

Question: are the Vsync and Hsync considered "returns"? If so then I need BNC y- cables to split the returns ?

Are the grounds saved in the BNC connectors?