From this blog post by the main guy behind IzPack regarding the use of IzPack in both Sun Grid Engine and Terracotta, I went on a look out to find the code so I could borrow some code examples and thanks to the world of open source, I found them so here, you go.
IzPack Install example form Sun Grid System Installation
Click Here to view
IzPack Code as used in Terracotta
Click Here to View
Enjoy
