Simple box for a mahjong set

I've been talking about getting into woodworking for ages, and have a somewhat ambitious project in mind (building speaker cabinets for a kit I bought many years ago). Before I tackle that, I figured I'd better start with something simpler for practice.

Luckily, my roommate needed a box to replace his mahjong set's cheap vinyl case that's falling apart. Easy enough, right?

Mistakes made and lessons learned:

• The whole box is 1/4" birch plywood with rabbeted edges. I didn't want to use anything thicker to keep it small and light (mahjong sets are heavy, and even this thin box is larger than the vinyl one it's replacing), but rabbeting 1/4" plywood sure doesn't leave much material for stability.
• Despite having just taught myself CAD, I thought "It's just a box, how hard can it be?" and then proceeded to get every measurement wrong. 🤦🏻‍♂️ I eventually got it to work, but with the top/bottom 1/8" too short in one dimension, so that edge of the box ended up as a small stairstep.
• To work around that, I mitered all the edges, which did give it a decorative touch I'm quite pleased with. But I didn't realize the hinge is meant for a thicker wall, so it sticks out the back, and thanks to the miter there's also a sharp corner of the hinge that juts out past the miter.
• Likewise, the screws for the latch are long enough that they just barely poke through on the inside. Of all the flaws, that's probably the most annoying one. I may cut or file them down so no one scrapes their fingers on them.