I recommend you look at Sub Gravity system.They have a choice of 1 aluminum or 3 stainless steel backplates, 4 wing lifts, and 2 harness types, 3 weight pockets styles, and backplate trim weights.
We understand what the active diver needs from a single tank rig. Simple, streamlined, balanced, and easy to travel. We built the Paragon single tank package to offer a modular and customizable BCD to best suit single tank diving needs. At the heart of the Paragon Single Tank Package is the...
sub-gravity.com
I use their 3mm aluminum backplate, 26 lb wing and adjustable harness for down south diving.