Free Beaded Back Panel plans - I've been known to use plywood for the backs of utility bookcases and such but there's no substitute for solid wood. It's actually pretty cost effective, too, since the boards are resawn, giving you twice the width per board. Besides, have you priced sycamore plywood? It also gave me a way to use up the flat sawn boards, leaving the quarter sawn stuff for the doors, sides, and top.
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