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Can I make a remote HUD from my PowerShots AV out to a small LCD?

I have a PowerShot A720 IS, and want to use its AV out to a small LCD to make like a HUD.  Say to shoot pics or vids from different heights, where I can see what it is shooting with this LCD HUD.  I was looking to get a replacement LCD screen for a cell phone & somehow get that hooked up to the AV out of the camera.

Attached is a crude drawing of what I'd like to do.

Picture of Can I make a remote HUD from my PowerShots AV out to a small LCD?