I actually am in to Nintendo 3/2ds hacking and am currently doing a hard mod on it (which is a project it in its own right.) To read the data from the NAND you must take a Micro-SD to SD Adapter and solder to the pins inside of it. I found this tedious and not clean. So as a first project for learning how to design a PCB I decided to make a Data-To-SD PCB. As it's my first I wanted a ground-work to start off with. So I took an Open-Source design (Under the Creative Commons 4.0 Share Alike Licence) by Aaron Weiss as a building block (Original Design here: https://easyeda.com/oshw/SD_Sniffer_Open_hardware-UoUcunFXf)