So, I've wanted to do a project like this for a while.
Its the concept of a GameBoy Advance (NOTE: Not the SP, never really liked them) being used as a housing for the Raspberry Pi 3.
You can pick up a cheap housing for the GBA online, and building 2 custom breadboards for the buttons. As long as I can remember, the screen size is about 2.8" and the Adafruit one should fit fine. If you are wondering how the Pi would fit in the thin exterior of the GBA, pulling out the USB and Ethernet ports is possible, and reduces the form factor significantly.
What i am wondering, is if this project is at all possible - I have all the parts listed below, don't be a stranger and leave a reply!
[The buttons and breadboard are also found on Adafruit, just too many of them to sort out right now]
Charging Stuff etc.
I've probably forgotten a lot of stuff, but it's a list so far, eh?