I know this is sort of still doable with aliexpress kits, but I miss the days of being able to make “weird” builds. My first build was an Athlon XP-M 2500+. It was a mobile chip that was just a binned desktop chip. It used the same socket as desktop, had no IHS, and ran at a “lower voltage” thanks to the binning. Overclockers DREAM in back in like 2005.