RaspberryPi Zero Case with Magnets

My version of the RaspberryPi Case with magnets for the RaspberryPi Zero. This is an similar design as my A+ case http://www.thingiverse.com/thing:580757 or my RPi 2,3 case https://www.thingiverse.com/thing:688135
The RPi is held in with M2.5x6mm screws in the bottom shell. The screws are directly bolted into the plastic. I usually make sure that the holes fit the thread by drilling it with a 2.2 mm drill.
The top attaches to the bottom by 4 magnets. With that I am able to achieve that there i