This is a simple case with no screws, tall enough to fit a large heat sink. Assembly is simple, just press on the IOPanel (clearance on Audio and HDMI but snap fit over micro usb/power connector on the left), slide the cap over the RJ45 and USB ports, and then slide the assembly into the base. Pi 3b should be level and everything should be lined up. If not, simply file down the supports opposite the iopanel inside the base.
You can very that the board is mounted correctly by lining up the USB ports or looking at the open vents opposite and checking that the pcb is flat.
updated rev2 10/27 shortened cap 1mm, chamfer on leading edge of base, iopanel .3mm thinner
The author marked this model as their own original creation.