I wrote the BeHappy settings before try it... and, after I applied the settings, it doesn't work here, too!
So, I let BeHappy to "Be Happy" without me, and tried Audacity instead... and it works flawlessy. Now I have converted all the tracks at correct speed/pitch for 23.976fps, 48kHz, Dolby Digital 5.1 - ready to be muxed with the video.
For the subtitles, I finished to rebuild the italian one, but there are many lines out of synchronization... I fixed at the best I can do with the few spare time I have this days, but I promised to release the alpha version before Xmas, so...
Right now I finished to mux the video with tsMuxeR, along with the five soundtracks and the ten subtitltes (five forced, five full); I'm going to watch all the movie to check if all is allright; I think the first thing I'll do will be to torrent the file.
It is around 8.4GB, so if you want to download it, take it in account.