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