Storyboard Bounds/Size & Layout Best Practices

I’m working through some prototyping while getting back into Corona development. The Storyboard sample code is my basis for this exercise.

In addition to the tab bar (which I’ve modified to switch between scenes onRelease), I also have a display group of objects acting as a “hud” which will contain real-time data (from a listener) at 0,0. It is 50px tall, just like the tab bar.

What’s the best practice (or different techniques) to ensure that my scenes are bound to the area between the tab bar and the hud?

I’ve tested setting the scenes’ screenGroup’s x and height properties, but logging indicates that it has no effect.

Worst case (or only case?), I can just place my screenGroup objects with the 100px height delta in mind, but was hoping for a cleaner method that enforced the bounds.

Thoughts? Suggestions?
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