Watch out! If you have cold water pipes over drywall, condensation can form on them and ruin all ofyour hard work.
Other than that, I would use 1/2" strapping runningperpendicular to the studs, with attachment blocksmade with plywood and pieces of 2 by 4. Use theplywood to sandwich the studs and the blocks.
(Check out how steel I-beams are joined end to end.)
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