Heh, heh. Great story about the Kiko cap! That's pretty cool.
Yep, the shoulder straps are nutria, and are made from a thin lightweight nylon. All of the Bop chest webbing I've ever seen had these nutria straps. Its the same material used in the shoulder padding on the assault vests. Speaking of the vests, I guess they have dried up. A few years ago they popped up on eBay fairly often. It's probably been ten years or so since any of the dealers had any quantity of them. I need to look through my pile of extras, but I know I have a couple of these Bop vests in poor condition. There might be one there in decent shape I'd be willing to trade. The chest webbing has always been more difficult to find. Although Craig had one on BidorBuy just a couple months back. It sold for only $26!
I'll keep an eye out for your Venda assault vest, as I don't have one of those. I believe Albert had one of these for sale, and if I'm correct, it's based on the SWA Pattern 83 vest, with an additional pocket sewn to the rear kidney pouch? I seem to think it was actually labeled to the Venda DF as well.