not sure about the recycle/repurpose part but this is how i have my girth belt straps attached in the back as well. i haven't seen a tutorial on it here though. i always thought it was pretty clear how the straps wrapped around the buckles but this could certainly be helpful for anyone questioning the accurate set up for ESB!
not to get too off topic but to me, the base green on the cheeks and dome looks much closer to the green of the ESB gauntlets and jetpack. the armor green is definitely a deeper, darker shade. here's a good reference photo with all three elements in frame that shows the contrasts between them.
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Sent from my R2 unit