Don Stephan
 Posts: 825
Joined: 2003-07-18
Location: Cincinnati, Ohio
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It's quite possible that unrestrained 1/4" or even 3/8" baltic birch ply would warp if veneered on only one side. If you screwed it to the ledgers there may be enough to restrain warping, but it's easy and not very expensive to veneer both sides at once in a vacuum bag.
Once the bottom drop in panel is ready, I would't try to glue the cedar planking to the panel. Nails short enough not to show on the underside of the panel aren't going to have any holding power, so I'd just lay the planking in loose.
Without a fixed bottom, the chest is going to be subject to lateral stresses. I'd either securely glue or screw the panel to the ledgers, with the ledgers similarly securely fastened to the carcass, and use at least 3/8" material for the bottom. Just my thoughts.
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