iFixit shared some details gleaned from the X-ray:
● Metal stabilizers underneath the wider keys (like the space bar) on the keyboard
● Tiny ribbon cable running up behind the display to connect the FaceTime HD camera
● Magnets in the speakers, trackpad, and fan
● More magnets in in the lower case and above the display to keep the laptop shut
Check out the X-ray image below and hit the link for iFixit's full teardown.