It looks like the keyboard might come out from under the bottom. I have a Toshiba with a similar design, so I know the bottom panel comes off with a number of screws to expose the motherboard and innards mounted to the top lid. What I'm guessing is that the board and other parts come off to reveal the keyboard mounted into the bottom of the top lid.
PITA, yes. (but no worse than a keyboard replacement for a unibody macbook, which I've done)