With the Arrow Presents: Raspberry Pi Arcade Cabinet Pack you can use every piece of the kit (including the box!) to make an arcade controller.
All thats needed is 4 #6 screws and bolts (available at your local hardware store), a Raspberry Pi (Pi 3 suggested) and an HDMI Monitor.
Start by downloading the template PDF below to get started!
Using an Xacto knife, cut along the 6 button holes, as well as the center hole on the left for the joystick.
Do not cut along the rectangle, that is used as a guide to make sure the holes line up properly.
For the 4 small holes around the joystick, pierce the box in an X shape, which will be enough to press the bolts through later
Gently push the arcade buttons in. They should be fairly snug, so support the cardboard from the back to prevent it from buckling.
Once they're in, the box holds up surprisingly well.
Press each bolt into the slotted holes.
Unscrew the red ball from the joystick and fit it in the box from the back.
Line up the screws and bolt it in!
Plug in the buttons and arcade as shown here. You can refer back to this earlier page for specifics.
You can also cut a small hole in the back to run HDMI & power cables :)
Finish the setup by following the rest of this guide to:
Configure your keyboard keys according to the RetroPie input configuration screen so you can use the joystick + buttons to move around RetroPie and play games!