From 2009 - 2010, I was one of a team of 3 developers working on WiiSX, among other projects. I’m really proud of the work we did porting PCSX to the Gamecube & Wii platforms - which are really resource strapped.
You can dig through the archives of EmulateMii to read more about the project. Or find the source code on GitHub. The project is still being maintained by some of the original developers!