POV "touch-screen"

Hi there, my first post...

I was thinking of making a POV rotor display that I can interface with.

If I put a photocell next to the LED's (maybie with a bit of soda-straw tubing to keep stray light away) on the POV rotor and plexiglass in front of the whole thing. Then when I put my finger on the plexi-screen, the photocell registers more light at that position.

Was thinking of maybie to be able to drag the text, select from menues and such...

Anyone has good design ideas?
Software tips?