Had some great help here already! But I get a little bit confused with things.
I know people say not to break a working gameboy but I think my heart is actually pretty set on me being able to play my own original gameboy, I think that's what's cool about it

I'm going to buy this PCB - https://www.zeroboy.eu/zeroboy-pcb-2-0/

And would absolutely love if anyone could help me with what else I would need to buy/do
If I open up my gameboy and drill the extra holes for the X & Y then wire up a screen, then after that I start to get lost haha.
Can anyone tell me what the green and blue parts on the left hand side are at all?
I'm imagining that I'd be able to use my own volume wheel and power switch, not that that saves any money really.
Using this I can just plug my battery in, but which bit of this is the charging port? It looks as though it's the green piece on the left, but also looks like the piece in the very middle of the image could be a micro usb?
Thank you so much!!