I already have bought all the required components. In the picture you can see a working proof of concept using a laptop. Right now I'm building the Linux-based operating system (compiling the system for running in the ARM board) and adding support for the touchscreen. Then I'm going to start focusing in building a frame for the screen and polishing the entire system to look good with the piano :) I should consider updating my blog too :P
Check out my blog in the link below for more information.