Hi !
I've made two PCBs, one for Arduino Uno, one for Nano, compatible with your project. I've cross checked pinout with a working prototype. The Uno can also be used with some of my other projects, so the wiring for SD card.
https://github.com/Raphael-Boichot/Collection-of-PCB-for-Game-Boy-Printer-Emulators
Raphaël