This bookcase was designed to fit (at least) 3 of the ATC Sized Faux Book Boxes. (I'm saying "at least" as there's extra room in case you want to display one of the books "straight on" .
Includes a nice deep drawer at the bottom (2-7/8" tall).
Laser-cut heavy chipboard. Ships flat but a breeze to put together with the slots and tabs precut (you'll just need to secure with a bit of white glue).
Finished size is 6-5/8" wide x 6-7/8" deep x 7-7/8" tall.
Note: this bookcase will also fit four books made from the Altoids Tin Book Covers.