Precision Screwdriver bit holder

I've purchased several of these screwdriver kits off amazon, and they're great, until the cheap cases crack, or break, or whatever. So I designed this tiered solution. I had a lot of extra real estate available on the top tier where I put the handle and extension, so I created some 10mm x 10mm spaces to store tweezers or whatnot. Enjoy.

Update.
I created a double capacity version, by mirroring and merging it to the original.