I had to think for a while what to do with the counterlung tie-downs when I swapped to the backplate. With the stock harness, the tie-down straps came up from the waist harness by the weight pockets. One of my biggest peeves about the original harness setup were all the freakin straps that had to be clipped and tightened. It was just far too messy for my liking.
So when I went with the hogarthian backplate and harness system, I webbed up a backplate as I normally would. I did concede and put one shoulder clip on the right side of the harness, as getting in and out of the harness with the loop and counterlungs in the way was just too much work. But as far as a failure point is concerned, I'm not too worried about it since it does not bear weight underwater and if it's going to fail, it will be while I am standing in the unit out of the water - and at that, the left side has no clip, so no biggie.
As for the counter lungs, I fashioned a dual clip system that threads through the loop of the crotch strap and comes up and clips one side to each counterlung. It's really clean, no excess strappage from the tie-downs and crotch strap itself. If I remember, I'll post a pic of it later on. I had standard waist d-rings for clipping off my bailouts, but for the shoulder d-rings, I use special under-counterlung d-rings that extend laterally from the harness so the d-ring clears the counterlungs, which lie on top of the harness. Other than that, the harness is pretty well the same as on my open circuit rig.