Oh nice ill take a look! We have a 10k pick and place machine over at a local makerspace and ive thought about prefab chips before. Just for fun, but its still a bit of money.

Sure. A hobbyist with the right equipment can make technically functional memory as a scientific curiosity. But making any memory module that is as powerful as anything that's come out in the last twenty years is going to require millions of dollars in investment and years of effort combining the work of thousands.