I was actually doing this to Little Mac as well. The best way I found to do this is to share soundbanks with other characters (project M did this with Roy and Mewtwo). There are empty sounds in every characters soundbanks so insert Little Mac's wav files into those empty sounds. You may also wanna amplify the sounds in Audacity so they can be louder in game. After you insert the sounds, open up the BRSAR in Brawlbox and navigate to the soundbank you used. On the right side (when you click a sound) there is the info. Scroll all the way to the bottom and you'll see something that says "misinformation" (I think. I may he wrong). see a 4 digit Number? Convert that number to hex using the windows calculator set on programmer. Write it down.
Repeat the process for the rest of the sounds you inserted. After that, you wanna use PSA to actually get Little Mac to use those sounds. I hope this helps
CS file, CSPROJ file, BMP file, RESX file, SNK file. Those are the files in the Be.Windows.Forms folder.
CS, CSPROJ, Personal Information Exchange, Windows Markup file, XML Document, Application Extension, RESX file. Those are the files in the OpenSALib3 folder.
CSPROJ, CONFIG file, Windows Markup file, CS file, RESX file, Application Extension file, SETTINGS file. Those are the files in the Tabuu folder.
And then there's OpenSA3.sln in the "root" of the download. There's also various txt files