Salut Stéphane, bienvenue sur le forum !
You're right, the layout is not online yet, I'll publish it once the project is started. It's to avoid people making Gamebuinos even before it's officially released. But why do you want the layout, if you don't mind me asking ? If you want to know in detail what is in a Gamebuino, just take a look at the schematics
PS:Don't worry about your English, I'm from France too, and mine isn't perfect