The plastic bezel damaged in step 6: would this part generally come as part of the rear housing or the front housing? If I need to order replacement parts.
Looks like the front housing...
I have what looks like a small circle of rubber, maybe thermal paste, between my Snapdragon and the case that isn't pictured in the teardown.
And I think the T1/T3 comment is spot on. I used a T3 to remove all the main screws, but don't have anything small enough to take out the monitor, at the moment.