With the display out and the battery removed right from the get, the chassis has little to hide: vibrator motor, headphone jack, and buttons are all that remain. Time to drain the tub.
A hefty and very well-adhered metal plate keeps the back button pressed to the case, and probably adds ingress proofing. (It also reminds us a bit of the bi-metal Apple logo.)
The G5's fingerprint sensor is a little different than the one we found in the LG-made Nexus 5X, but it houses a familiar set of spring contacts.