Secure the USB encoder to the base panel with M2x8 screws.
Add the two side panels and secure them with M3x12 screws. Do not fully tightem them yet, this will make it easier to add the rest of the panels later.
Add the two 24mm Push Buttons to the front panel.
Secure the front panel to the base with M3x12 screws, again don’t fully tighten them.
Add the six 30mm push buttons and joystick to the top panel. Use 4 M3x12 screws and 4 washers to secure the it.
Polarity doesn’t matter for buttons, you can connect them either way. Make sure to connect the joystick in the correct way(shown in the image below), otherwise only one direction will work.
Connect all wires to the USB encoder. And place the middle panel.
Close the top and secure it with M3x12 screws. Place the USB cable through the opening in the back panel and secure it in place M3x12 screws.