Cem TEZCAN has created another homebrew Commodore 64 Handheld. At its heart, the device is run with a Raspberry Pi, emulating a Commodore 64 via the BMC64 emulator. It has its own screen and two 18650 batteries inside that make it work for 3 hours and 55 minutes in full load with gamepad activity.
To build your own you can find all of the instructions at the following link:
Renders and beauty shots can be seen here: