There's also a custom box creation. French modder darthchris13 whipped up the creation and then compared it size-wise to a SEGA GameGear.
The SNES Portable sports a 2.5 inch screen, and according to darthchris13, the tricky part was getting all the SNES wiring into such a small casing. Nice work.
Une magnifique Nintendo SNES Portable et son emballage [Nowhere Else]