Finally I’ve started to rebuild the website (again) from scratch.
The truth is that I abbandoned it in 2013 due to lack of time, and till today all the time I’ve spent on it was spent for drupal mainenance. So I decided to drop dupal and move to something that required little effor for mainenance.
My choice went to jBake that generate a static website, that have not need for patching or similar security mainenance. Another advantage of jBake is that uses a template system common in JEE world that I already know.
Just a final note: Drupal is a really good platform, but it is just too powerful for a simple website like this is now.