UNIX for Advanced & Expert Users

Ladies and Gentlemen:
I am short on time and need to get up to speed fast on the use of flash archives. I am very familiar with Jumpstart and have used it successfully for the past 5 years. The current project I am working on requires optimization of time and speed when deploying systems which is why I am considering trying to implement a Jumpstart/Flash archive solution. As usual, the customer is strapped for time and funding and thus cannot afford me the luxury of experimental testing on my own to determine if a Jumpstart/Flash archive is a viable solution. So I am turning to all of you to help me determine if I should push this approach any further with the customer or should I just drop it. I need fairly technical answers to the following questions:
1. From what I have read, you can create a flash archive of a "master" system. Can this archive image be an image of the entire disk? If the answer is yes, then when you go to restore it using Jumpstart, does the disk you are restoring to have to be of the same disk geometry and size? I believe the answer is probably yes, however, the logic behind the question is: Say I am using a system with a 36GB disk as my "master" system image. After building it, the total disk space "used" by all partitions is only 15GB. Can I use Jumpstart and the 36GB Flash archive image to restore it to a 20GB disk? If the answer is 'NO", I need to restore it to a disk with the same geomentry and size, then is the real solution to this scenario to use flar create to create separate archives of all the master disk partitons?

2. When using Jumpstart to restore this "master" image (whether it be the entire disk archive image or each separate archive images of the master disk partitions), how does Jumpstart account for changing of the hostname, netmask, default route, IP addresses, domainname, etc.? (In other words, the unique system information that varies from system to system.)

3. Assuming that jumpstart can somehow reconfigure the system-unique parameters after installing the master system disk image/partitions and everything else remains equal, will using Jumpstart in conjunction with Flash archives be any faster than just using Jumpstart with finish scripts?

Thank You for your wisdom and help!