Nevermind, I figured it out. I don't know HOW.. but I think I managed to get the .sh file as a remnant from a previous install, and never actually INSTALLED the package. :)

I've been building my system in stages, testing out what works, etc. I have the ROMs/BIOS saved on a USB Hard Drive that will sit inside my box. That way I could remove it to make transferring everything easier. At one point, I had moved EVERYTHING to a spare "Temporary" folder on my computer. Then I slowly added stuff back one by one. The Ports were the last section. I moved over the script to launch it, but never actually installed it.

For reference, it doesn't install the data to the game in /home/pi/RetroPie/roms/ports... it installs them to /opt/retropie/ports/smw