You need the ply to hold it up though with no base. I agree with the skip sheathing, but there's no shear value to it. The only way I know of to get it light is to use all ply.
You basically just start with a stud on the wall screwed into the backer on the inside. Apply ply from there. Some numbers to crunch, but from the sounds of it, you will be supplying those. I don't really see any need for any fancy creative stuff. It's just a hollow dead space.
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