After scouring the internet for any documentation on the file formats used for the character models (namely the .gpl files) I’ve found the one (and seemingly only) source of information.
There are some executables included with the sdk that enable previewing of GPL (geometry), ACT (hierarchy), ANM (animation), SKN (skinning information) and TPL (texture) files. However, it seems that these require some sort of PowerPC configuration through either the dolphin development hardware or an old powerpc mac. There is a previewer.exe in the sdk, but I haven’t been able to get it to load a gpl without crashing so far.
Honestly my best chance will probably be emulating an old build of Mac OS X (e.g. 10.5 Leopard) and trying to load the preview scripts on that platform.
I will post back with my results.