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Look at the link for superchunks in my post above. You don't need to attach them to the wall; they will stay in place from pressure and gravity. Most people then build a simple wood frame, covered with cloth, to go over it.
Yes, I'd probably cover the concrete with rockwool.
You could potentially build a giant frame on each wall, that you would ultimately cover with cloth, that would incorporate both the absorption panels on the flat wall and the superchunks in the corners. Lots of ways to do it, it doesn't really matter as long as there is nothing blocking the airflow to and around the rockwool.
Think creatively and build what you think will look good. For bonus points, get your wife to help you design the look.... ;-)
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