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Phones have touch screens that are better touch-based MIDI controllers than paper+camera :) I've successfully played songs on phone pianos.

However, neither solution is even close to a tactile instrument.

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You are absolutely right, my intention behind it was that you could really play the piano not on a small screen (like a phone) but like an actual sized piano. I didn't want to buy one because they were expensive and I am more like "free is the better" guy. So I decided to make one on paper. This being rather a prototype, I am currently working on designing and mapping keys, improving upon touch recognition. ( also I have mailed you )

I read this morning, I have a half-written response.

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