I'd do the shelves with ply, faced with solid. . . possibly put on
with biscuits or a continuous spline. For the back, it's not that
difficult to edge glue solid material. I just posted a gun
cabinet photo that has 1/4" edge glued "boards" for the back. It
was sturdy as heck and the glue held just fine.
I was recently at a reclamation yard near Coventry and they had some
beautiful oak boards, about 8.1/2" wide and somewhere around 1" thick,
2.30GBP per foot. I remember looking at them and thinking they would make
a nice bookcase, or even a small "bookshelf" loudspeaker.
Unfortunately the bookcase in our house that desperately needs replacing
(veneered chipboard) is "mahogany", to match the rest of the furniture in
our lounge/dining room
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