Tom, that is just downright sweet!
How do you keep the right swinging section from getting dinged against the adjacent fixed section when it is swung fully open?
There are stops on the top of the bookcases with bumpers, they are adjusted so the unit stops about 1/16 short of the pilaster.
If you look at the top and bootom where the horizontial members are, you'll notice they were cut and set so when the units are open the sharp edge of the miter does not hit.
Tom