pi zero in gameboy advance

[ShipStreeT]

sorry for my English in advance :p
so long ago i tried my hands on shoving a pi zero inside a gameboy advanced SP and failed,
decided to just put the pi inside a old gameboy (big gray ones) and was done with the project.

now that i got my hands on the new pi zero W i really want to pick this again and try making a retropi inside a gameboy advance.

i was wondering if the community could give me assistance with this project.
first thing first is figuring how the buttons would work i got 2 options

1. buy some not working unit and cut the pcb so i only have the buttons to conserve space.
   i found some pictures of some one who tried doing the same project
   
   
2. find some one that can circuit design a button pcb that will fit in the gameboy advance

after that a screen is needed.
the first is the adafruit 2.8 tft screen that could work
https://www.adafruit.com/product/2298

the second one is some generic tft screen i found off ebay
https://www.ebay.com/itm/2-8-Nextion-HMI-TFT-LCD-Display-Module-For-Raspberry-Pi-2-A-B-Arduino-Kits/172229265744?hash=item2819aa0950:g:tjAAAOSwbYZXUega

for power i will be using the adafruit powerboost 1000c, it got every thing i need and i happen to have one already
https://learn.adafruit.com/adafruit-powerboost-1000c-load-share-usb-charge-boost/overview

and lastly how can a retropi be complete with no audio, i saw alot of posts about those small usb audio things and figured it would fit
https://www.amazon.com/gp/product/B00IRVQ0F8/ref=crt_ewc_title_huc_1?ie=UTF8&psc=1&smid=A29Y8OP2GPR7PE

[ShipStreeT]

i found a pcb files for the gameboy advance that some one did a pi with it.
after alot of struggle with no experience i managed to modify his pcb to fit my need.
i take no credits lol i even left his name on the pcb

i hope i did the modifications right , i have never used a circuit design program nor i know how to lol