This is currently incomplete! I did not document all the IOS changes I've done.
I have a 2008 Nintendo Wii, which will have a 2 GB SD (not SDHC) card that holds ProjectM and Homebrew software, and a 32 GB USB flash drive housing my purchased ripped games on the bottom-most USB port. This guide will assume both flash devices are newly formatted with the SD card being FAT16 and FAT32 for the USB drive.