The Bosch screwdriver case has a compartment that can be used to store bits. But it's inconvenient to store them. Much more convenient to store in a two-tiered cassette.
The cassette consists of two bit bars and two spacer bars. I don't think assembly will be difficult. I printed a PLA cassette at 20% coverage. Gcod contains the complete build kit.
The author marked this model as their own original creation.