Pierre-yves Baloche has done a great write-up of his current project. He’s taken a Raspberry Pi and Pi TV HAT and created a TV recorder. He’s used a WD Pi-Drive and a spare Pi Zero case to house the HAT, connected with a ribbon cable and worked out how to get the software working. After this prototype stage, he then created a 3D-printed enclosure to house the HAT and some indicator LEDs in the shape of a Pimoroni Blinkt. You can read how he did it here.