I second the idea of going with a SNES + Super GameBoy and giant game cartridges.
Extra bonus points if you make giant game cartridges with labels and everything for these four classic games:
- Tetris
- Super Mario Land
- The Legend of Zelda: Link's Awakening
- Metroid II: Return of Samus
You might want to have those carts made by CNC to have a giant "Nintendo" engraved at the top like the real carts.
Also, I am wondering how you made the concave areas around the gamepad and buttons.
P.S.: are you going to round up the edges of the select and start buttons slots? Will you add a 1/4" stereo audio jack on the bottom panel once you're at that point in the build?