If you go back a few years you'll find a ton of argument about if Davin Felth "Look sir, droids" even had a lab pipe to begin with. It was decided since there's no clear picture of the left side, those emulating him will need to have it. Seems that those who have received SWAT status for this particular trooper all mounted it on the tray and not along the frame as the Captain does. The best reference for Davin Felth's pack build is this:
I still need to add the D ring and antenna to my radio. I couldn't tell if there is stitching on the leather wrap around the radio so I left that off for now.