The splits are only built into the XL size textures. You can add splits to the other sizes (and any other texture you wish) by overlaying the included .png in the resource folder onto the body texture of your choice using an image editing program such as GIMP.
As for actually setting up the hack, setup the directory in your SD card to read:
\private\wii\app\RSBE\pf\Fighter\SZerosuit\
Inside the last folder of that string place the .PACs and .PCSs from the size of your choice included in my pack. If you don't know what size take a look at the size comparison pic on the download page for the hack.
The numbers correspond to the outfit color you choose. Off memory for Zero Suit Samus:
-00 : Varia Suit
-01 : Pink Suit
-02 : Green Suit
-03 : Fusion Suit
-04 : Gravity Suit
-05 : Phazon Suit
The body textures for ZSS have already been properly matched so that they match the appropriate Samus suit.
I solved it, I don't know why, but I opened the .pac's that I put on the SD to preview the models and then it worked perfectly (when playing before, the three sizes were the same and without splits) without substituting the files again.
Anyway, thank you.
P.S I'm looking forward to see what you'll do in the future (maybe round breasts for this to make them more real, I'm only suggesting
).