Parent position of text layer to the bottom of a 3d layer?

Man this is hard to describe.

Here is what Im doing in a nutshell.

3D Text layer swings like a hinge from its anchor point which has been moved to the top of the text layer.

I duplicate this text layer and move it below the first one and am trying to parent the anchor point of the new text with the BOTTOM of the swinging text. They will look like they are swining independently but are "hinged" together at the bottom.

Here is an example:

https://vimeo.com/18960587

Notice how the first 3 words that pop up in the animation are "hinged" together.

I have been thinking how to do this and for the life of me cant come up with any ideas.

Help!