Well after almost 2 years... it's finished!
I call it my ghetto build. Had to use a Powerboost 1000c as the original chinese cheapo board couldn't provide enough power. Also the screen controller board also stopped working and had to be replaced.
Key features:
Black case, black/ red buttons
Uses a Pi Zero W
MicroSD is accessible from the gameboy cart at the top.
Four buttons plus L&R back buttons
Basic button board
Auto shutdown and emergency reset
Speaker and headphone jack with volume control
USB A port
1300mah lipo (I had a few knocking around)

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Plus another GBZ using Helder's AIO board. Only have to program the chip for the PSP 1000 thumb stick, otherwise this one is finished too. Oh and remove the temporary film from the screen.
Key features:
Black case, black/ blue buttons
Uses a Pi Zero W
MicroSD is accessible from the gameboy cart at the top.
Four buttons plus thumb stick plus L&R back buttons
Helder AIO board
Speaker and headphone jack with volume control
USB A port
1300mah lipo (I had a few knocking around)
So there you have it; two GBZs built in different ways.

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