Raspberry Pi 3 Case - The simplest design

A Raspberry Pi 3 has I/O ports on three sides. I found it hard to measure the openings and customize the design. So I used this laziest approach, with just upper and lower cover only. The Raspberry Pi can be fixed by M3 nylon screws. I used M3x8 nylon screws as the base stand and M3x25 to fix the body. We may use M3x40 instead if we are going to put an expansion board on top of the Pi.