I have taken it apart. The top and bottom pretty much separate between the silver top and the black base. All the screws are accessible from the bottom. There are none under the pads, nor do you need to remove any under the battery. There is one under the keyboard, however. After all the screws are removed, the parts are snap-fit together.
If you only need to align the rear, you can just remove the screws in that area rather than the the entire unit.
Hope that helps.