This is version 1.0 of the box. I'll refine the design as I go along. The "latches" are made so that the density of the wall is maintained (for even light distribution) but this didn't matter much when printing on a Makerbot with white plastic material.
The density of the walls were decided by calculating how you could make the latch solid enough, meaning it had to consist of at least 3 layers of material. We had some problems getting the Makerbot software to add enough material for this part. It works fine, but may require some tweaking.
The next version will also include a tiny "slit" between the latch on the lid and the box, so it's easier to slide a screwdriver or knife in to re-open the box.