Had an idea: I call it the "Jaguar-Vision-5200", because those would be the games it's made for (Atari Jaguar & Atari 5200, Colecovision, and Intellivison) might be best for emulation rather than actual hardware though...
Split in half, imported into TinkerCAD & hollowed out. Added face buttons to see how it'd look - 4 main action buttons for Colecovision & Intellivsion games, 3 start/select buttons (might change later), a joystick, and "famous" keypad...