The project in its first state is now completed. It's been used for more than one year in music school with no real problem (only e few leds on one led strip that were dead).

Each octave is less than 20kg, and with a finished size of 105x100 each, it can fit very easily in most of the cars.

The Ethernet connection is very simple to plug in and the full piano is assembled in less than 5 minutes.

The master part can be drastically improved (and will be).

You can see on this last picture the whole 4 octaves keyboard, The small box on the left is the Master. I created a site http://www.grand-piano.fr/ and will create soon a blog for further discussions and explanations. It's not ready yet, but I also have a daily job that I need to do.

Feel free to make any suggestion about how to improve and what functionalities you'd like to see added.

My friend was also saying that we may sell it or at least sell kits when electronic boards will have a better design.

Thanks