Tray for holding the screws from a laptop

I designed this so that as I take a laptop apart I can not only keep the screws in one place and not loose any, but can also have a general idea as to where they came from (so that hopefully I don't end up with a few of those "I'm sure it doesn't need this screw put back in"). It is broken into 4 sections, Screen, keyboard, base and inside and each section has 12 troughs for containing screws in their related spots on the laptop.