The compartments allow for storage of smaller hex keys as well. You may continue to modify the case to affix hinges and/ or clasps, but I intend to hold them together using some leather and eyelets.
Update: I have modeled a lid for the box. I have seen @tomb60 's lid as well. The only difference with my model is the presence of 2 tabs on mine to help with opening. You may decide to model yours with a cutout slot as an added feature to make opening easier.
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