That took a while didn't it, please see the download page for a full list of changes.
Download Stock Sides+ Multiplayer compatible version - ModDB
Here are some Maps that also utilize some of this side mod's features:
Download Galva Minor Ventara City - ModDB
Download Yavin 4: Buried City - ModDB
Download Roche Asteroid Field - ModDB
Download Space Galva Minor - ModDB
Last but not least are the source files for Stock Sides+
I see the final version released. File is called "data 2." Do I replace the original data 2 with this one?
Those are the source files, don't download then unless you want to mod the mod.