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Nothing on the hardware side of computers is really a "project" these days to be honest lad. Unless you want to start faffing around putting in a custom watercooling loop, it's all very straightforward and modular. PCs these days, even high end monster rigs, take less than an hour to assemble even for an amateur (not counting, that is, all the time spent watching instructional YouTube videos).
You'll probably get more mileage out of software tinkering. Mod your Windows installation with a snazzy customised GUI. Change all the icons to glossy white, find a nice custom theme, set up Rainmeter, make a personalised rocketdock with stack docklets, all that jazz.
I once spent more or less a whole weekend making my old Windows 7 machine into a sci-fi looking minimalist masterpiece, while still having everything I use accessible within one or two clicks. That's real satisfaction, if you spend a lot of time actually using your pc.