My son's 28s fell apart -- apparently it had been flexed to death stuffed in his backpack with all his high school books.
The keyboard faces are snapped into the two "backs" (one is actually the "front" . . . ) and held in place by an array of plastic front-to-back pin-and-socket connections. (There are LOTS of 'em -- I'll be able to give more details on Monday, if I remember.)
I seriously doubt that the connections will snap apart without breaking a great many of them, but I haven't yet tried to take a working machine apart.
On my son's broken unit, the left-hand (alpha) keyboard was coming apart, and the keys were dropping out. I popped it apart the rest of the way, and took the opportunity to pop apart the right side too, with its PCB, battery contacts, & etc. I believe that some of the pins are still intact after my "surgery", but not many. (I just don't know how many of them were already broken at the time I started in.)
I'll take another look, and if no one has given a more detailed description by Monday, I'll try to do so.
Good luck!