Hi Gary,
The dio looks great. I like the trench and groundwork a lot … Nice work!
If I may, here’s another (easy) solution for rifle slings: Plain ol' copy paper works well for slings, belts, straps, etc.; it can be easily cut into strips, and once painted, it can be twisted and shaped into a somewhat realistic sagging or even a taut appearance.
In addition, many modelers use rolled lead foil — works very well. If you decide to go that route, I couldn't begin to tell you which bottle of wine is which, that would have lead foil ... but I do have another source:
Verlinden Lead Foil at Scale Hobbyist.com HTH.
—mike