Thanks! I’m going to try putting thin ply behind. By the way, I did get my boards at Lowe’s as well… Design-Innovations-3-5-in-x-8-ft-Natural-Cedar-Tongue-and-Groove-Wall-Plank (sorry, can’t add a full link). Is that the kind you meant? I noticed it had an unexpected smell when I unpacked it, and it turns out it’s “chinese cedar.”