|I made one for Cherry Pie, too.|
I was making cases for a Bible and Triple Combination, soft paper bound, which together are larger than a mini-quad (what Melissa at PolkaDotChair was making a case for). I like my cases to fit pretty closely so the books aren't wallowing around in there. Also because my kids have a tendency to hoard bits of trash and I didn't want much room left for bits of paper. If you want to make your own case for scriptures like ours and don't want to do the math, here are the dimensions I used. (Also in case I decide to make more and want to remember the math.)
1-- 9 3/8 x 8 inch for the flap
2-- 6 1/4 x 8 inch for the front & back
1-- 4 3/8 x 20 inch strip for the gusset
2-- 2 1/2 x 16 inch strips for the handle
It took a little bit more than a fat quarter for the lining:
2- 6 1/4 x 8 inch for front & back lining
2- 5 1/4 x 8 inch for front pocket
1- 9 3/8 x 8 inch for the flap lining
1- 4 3/8 x 20 inch strip for the gusset lining
Seam allowance 1/2" everywhere except the handle- do 1/4" seams on the handle.
The first case I made was too tight. The gusset was 1/4 inch too narrow. I ended up unpicking all the seams and resewing them smaller so that there would be more room in the case.
**This is one of the secrets I've learned that has made me happier with my sewing. When it isn't right, I take the time to fix it. It's totally worth it. If you hate unpicking, check your seam ripper. If it is so rusty, it looks like you stabbed someone with it and left the blood to dry, spend $4 on a new one. Totally worth it.
**Secret #2 top stitch. It makes everything look more professional.
I adjusted the measurements for the second case and it turned out perfectly. (The measurements above are the adjusted ones.)