I'm excluded from that group, hence my disclaimer, but it is rare you see major variations from that setup. The majority of us either still use that configuration or use it with slight adaptations. The regulator configuration is huge, and that is one of the least "adapted" parts of the rig. I don't dive with a one piece harness, I will if that's the other option but you'll never see a backplate of mine with one on there. For new divers though reading through that gear configuration and getting the baseline stuff down there, then they can adapt as they need to.
I don't use a long hose unless I'm in overhead and my can light isn't on my hip. From what I have seen though, the basics of that GUE setup is the basis for all of the doubles rigs. I had mainly posted it for the regulator configuration and the 200din vs 300 din vs yoke. For that stuff, that page is a lot more concise than most anything he'd find on here.
To the OP. If you read all the way through that you'll have a great understanding of the core rig that most of us dive. There are differences in all of our diving. You'll see the DIR/GUE crowd diving primarily Halcyon equipment. This is the brand pushed on that page and there are connections between GUE and Halcyon in the higher ups. It's quality equipment. Overpriced IMHO, but good stuff.
For my doubles rig and why
DiveRite Deluxe Harness QR- I needed the QR because of my build type *huge chest, tiny waist*, and I prefer the chest strap because my arms lose circulation quickly without it.
AL Backplate-I don't need any weight with my steel tanks. With AL80 doubles I wear a SS backplate
300 bar DIN valves-I have older PST HP tanks and didn't have a 200bar option. It would be nice for filling though
PST HP120's for doubles-the tanks I had. They're long enough which I like. I also use PST 100's
HOG regs-used Apeks, but due to lack of parts availability for me *never had a problem with the shops getting them, they just wouldn't sell to me...* I switched.
So as you can see, compared to the Halcyon/DIR setups in the pictures mine are very different. At the same time, they are still based on the same backplate/wing/harness setup. The tanks and regulators look the same. My one exception is if I'm diving in a wetsuit I have my LP inflator hose on the left post instead of the right post. This is mainly to make sure that I know both first stages are functioning properly throughout the dive instead of all of the LP being used from one and only HP on the other. Again though, same basic setup is there with the same fundamentals. I started with the DIR/GUE type setup and varied from there for what I needed. Unfortunately for some, that variation removes them from the DIR/GUE circle. Pros and cons to each, but for me there were more pro's involved in being comfortable while walking around on land than there were of having identical setups to my buddies. Obviously it's move involved with that.
and with that, off to teach a NOAA Scientific Diver class, WOO!