What’s doesn’t work with your fat PS3 now? Only the super slim models have a chance of fitting inside a fat PS3 without a lot of time and effort that won’t be worth it to anyone. Look into people converting consoles into handhelds to get an idea of how much something like that entails. It’s kind of an extreme example but fundamentally you’re doing the exact same things. It’s much more worth it for anyone to just buy a fat PS3 or fix a broken fat model.
Otherwise fully disassemble the slim and fat then measure what tolerances the slim needs to be to fit inside and cut the pcb to size if most likely necessary making sure to not cut any traces. Then you'll need to source cable extentions for everything that connects to the motherboard which means for some like the bluray drive you're gonna need to order them custom made. Then you'll need to get a custom heatsink manufactured for you to keep it cool or somehow figure out a way to modify a liquid cooling system & troublshoot all that. Then after all the testing has been done and the size of everything meets the tolerances you'll need you can assemble it.
Tl/dr this project will take several months to over a year and potentially hundreds of thousands of dollars in everything that would need to be custom ordered as well as replacement parts for when things go wrong and stuff breaks
TL/DRA the project is way too long & expensive to be worth it to even a billionaire
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