What happened to “the brick”?
Apple is now using CNC to machine the MacBooks from a solid "brick" of aluminum.
Watch the video which shows how it's constructed.
http://www.apple.com/macbook/the-new-macbook/
Then hit the design tab for a more detailed description.
From an industrial/mechanical design point of view this is a truly elegant and brilliant solution.
"Less is more", Mies van de Rohe.
Look for it to win even more design awards for Apple.