Design for development of solaris package (installer)

Hi,
I am new to solaris. As I am assigned to a new task to develop a installer for an application on solaris10 machine, I need to prepare the design document for the installer. ( I came to know that in solaris all the instllables will be considered as packages and and are not like .exe's).

So if any one who has previous experience of developing such packages , I Kindly request them to advice me with some tips.( I have refered to Application Packaging Developer's Guide from Sun microsystems which is excellent, now I got an idea how to develop, the question is about preparing design document. )

If possible can you please give the Table of contents of the design document.

If possible please recommend any books as well.

Thanks in advance..
RaghuDeep Amilineni