I just finished throwing my notes out with the trash (can already at the street) ... oops ... but I wanted to mention that the front side of the case is actually smaller than the back. I don't recall if it was 1/16ths of an inch or 1/32nds of an inch -- but it's one of them. The template is therefore 1/16th or 1/32nd shorter in width on the front. I don't think the case is molded exactly 50/50 at the spine. Close, but not exact.
The point of me mentioning this goes back to design theory.
Be very sure that you don't design anything important at the very edges of the spine or case faces. You might have to cut more off when fitting the paper into the case. Give yourself a cushion of 1/16th to 1/8th when laying out text and images. This doesn't mean the edges should be black, but rather let the edge bleed out with fill color background or a background image.
You may also want to trim an extra 1/32nd of an inch off the top and bottom, so the art stays 100% underneath the plastic. Otherwise paper may edge outside the plastic case, and get rubbed off from normal use. I always do this at the cutting stage.
Never try to create art that has a thin frame around it, because it will end up uneven when cut and fitted to the cases. Framing design elements should always be recessed by about half an inch to the interior.
Cut your art with a straight-edge metal ruler, a cutboard, and a sharp Exacto knife. Scissors and those "cutters" are sloppy. The only thing better than the knife/ruler/board method is a professional press cutter (as used on magazines, etc).
I was a print/page designer years and years before I started in digital video. (Still am, too!)