The base sculpty files are just three files :sculpty-sphere.ac, sculpty-cylinder.ac, sculpty-subdcube.ac.
When you download the plugin from here :
http://www.inivis.com/secondlife.html
and unzip it, you will see a subdirectory called "baseprims" which contains the three files.
To create a sculpty just load one of those files as you would load any ac3d file ... and sculpt away
griff