Another "single tool" recommendation is the router. Fixed shelves can be placed in shop made rabbets, and vertical rabbets can be made to accomodate metal stips for adjustable shelf requirements.
If your project will be painted, look for a lumber yard that carries pieced plank. I've used poplar PP for some bookcase units that I fabricated in shop and field assembled/installed.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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