95% done.
Turned around for 5 minutes to take a break, and someone decided to test out the drawer:
Mounted frame in the truck. Think that's enough bearings? :D
Attachment to the front D-rings:
Attachment to the rear D-rings:
Partially slid out. Got to add safety hook to prevent accidentally sliding the drawer all the way out:
Closed:
View through driver's side windoor:
I've got the top plates for the pocket holes cut, just need to wrap them in carpet and mount the euro hinges (tomorrow).
The fitment is incredibly tight - I don't even need the latch I put in place. A simple chest handle would have been just fine in this case. I'll leave it as is for the time being. I also should have made the drawer's front sit a bit higher as it does catch on the tailgate when being slid out, but it's really not too bad, and the part of the tailgate that gets rubbed is plastic and easily removable/replaceable, so I'll leave this as is, too.
Overall very happy with how it turned out!