We (Santina and my dad helped) built some built-in bookshelves in our house in North Andover, MA. It’s too bad we couldn’t have taken them with us to California. I guess I’ll just have to make some more once we buy a place out here (whenever that is).
The top, bottom, sides, and shelves are all 3/4″ maple plywood. The edges of the plywood are finished with maple veneer. The top of the unit is trimmed with an ogee-type hardwood trim. The shelves are adjustable. There are lengthwise braces, one maple (under the top) and one pine (under the bottom shelves) to add stability to the unit and to serve as attachment points for screwing the unit to the wall studs. There are some nifty notches and grooves that play structural roles, but you can’t see them (I cut those with the router). The whole thing is painted a shade of white that matched the trim in the house. I’m not the biggest fan of paint as a finish on hardwoods, particularly something like maple, but it turned out pretty well.