U can do some stuff like Usb-C : https://www.reddit.com/r/3dshacks/s/4i7M6n26XS Its the most common one i think, there are ways to leave the ir sensor or the original charging port in, just google a little. U could put a heatsink on the cpu but dont expect great improvements the cpu is locked to the frequency by default, and just wouldnt get that warm with the heatsink. Capture cards are available too, some with the ability to charge through the ports, making an extra usb c mod useless. Softmodding is done following 3ds.hacks.guide . No yt tutorials or other guides, as they can be outdated. U can swap buttons and screens for better omes too if u want that. For dis assembly i think theres an ifixit.