Here are some finished pictures, with my apologies to everyone who thought i should leave some natural wood. In the end I decided that I really did want a "built-in" look where the bookcase felt like just another one of the white walls:
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with all the trouble i went to to install "crown molding" at the top, you can barely see it (neither in pictures or in real life)!
ps2.
those funny little things you see on left+right side at waist level are speaker wires, since i plan to add some speakers at either end (i only wish i had remembered to put a power outlet on each unit).
ps3.
the very bottom left+right corners are not "covered" -- there is ethernet, power, and cable wiring accessible there.
ps4.
final dimensions: 17' long by 9' high, 12" deep at bottom, 8" deep at top.