Pi 3B case, 30mm fan

Orange Pi 3B case from remix of Raspberry pi 3B case. Uses M2.5 screws of appropriate length, friction close for top. The OPi board layout is very close to RPi, but the Orange Pi needs additional room for the M.2 slot on the bottom, has a power button on the side, and needed some additional clearance to access the SD card. Changes from original shown in images.