This bezel is designed to put a Raspberry Pi 0/0w into a Sega Genesis Cartridge Shell. Initially I wanted to include adapters for full USB and HDMI ports inside, but space proved to be too much of an obstacle.
You will need to remove the front plate from both halves of the shell. Be sure to carve them as close as possible for proper fitment. I used an X-acto knife but you could use a dremel or other blade.
You will need an OTG adapter or hub to use USB devices; I'm using this one. You will also need a mini HDMI to HDMI adapter such as this or a cable with mini HDMI on one end and regular HDMI on the other.