So, a thing happened on the road to Centurion.
More to come. But it's a start!
P.S., thank you again, Ukswrath, for your great (and detailed) HWT Pack Build Thread. I'm going to explore a few alternative methods/parts, but overall, I expect (and hope!) my pack will be extremely similar to this reference build.
Link to CRL for ease of reference: http://databank.501st.com/databank/Costuming:TK_hwt