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I don't think the ply(wood) would stop all the bounce/movement - that's quite a long span! Depends what weight will be where on the finished shelf I suppose, but I'd try and get a central support in there if it can be unobtrusive. Maybe a large right angled bracket off the back wall. Or just a central supporting upright, if that doesn't offend aesthetics.
si_mon628
I’m making a couple of torsion box alcove shelves.
2.3m span with 30x30 battens which are fixed together and to studs.
It’s solidly attached but I can flex the middle of the span up and down by 5mm with my hand. Is that going to sort itself out with 12mm ply glued and nailed to top and bottom?
Wondering if I need more spans or worst case some floor braces?