The design is actually really good. It's better than other pocket tools because screwing and unscrewing the compartment is a pain. It's also a pain to dump out all of the drivers to get the one you want. Plus if you get anything wet in there, they all rust.
Yours looks very easy to access the needed drivers. You might want to color code the drivers so you know exactly which you are pulling out.
Like everyone else said, it is too big. You can probably make it much smaller and still keep all the functionality. Maybe even create a small compartment to hold extra screws and stuff.