I sewed the zipper into the middle of the case instead of towards the top. I also sewed across the four corners to give it some depth. Looks good from the outside. Inside's not so pretty, but no one sees that. I also broke a needle while sewing this - I think some parts of the case were too bulky since I used canvas on one side. Next time, I might opt for something thinner.
And also, my companion while sewing:
She has been super cuddly, and therefore cute, of late.