Thanks to everyone for your hard work in getting custom content for Mac users. I probably won't post much, but I did find a weird little work around for the Rocksmith Toolkit Converter not finding the CDLC you download from Customs Forge. Open up the Rocksmith Toolkit.dmg file that you downloaded so that it mounts on your desk top. Throw your downloaded CDLC songs in that folder. When you open up the Toolkit and go to find the CDLC files, they will be located in one of the Letter drives ( like E of G). Then when they convert, drag them to your Rocksmith folder.
Now If only I could find out how to get the Songs Manager to find the Rocksmith Steam root Folder