Using Time Machine to setup new Mac

I have just bought a new Mac and need to take all the data for 3 users from the old one. The old Mac is backed up using Time Machine to an external 500Gb Firewire drive.
The problem is that I can't do all the data transfer in one go and due to space and time restrictions I will need to take a couple of sessions to complete all this. This is what I was thinking of doing ...
Backup old Mac using Time Machine
Create a Root account on new Mac
Log in as root and run Migration Assistant and restore user1 and user 2 and user3 from FW drive
Pack away new Mac and plug Time Machine drive back onto old Mac
Old Mac continues updating this Time Machine drive until a few days later ...
I can either just plug in the Time Machine drive to the new Mac and restore back to just after the point I was on the first installation or I could just repeat the whole thing again. There is over 300Gb of data to transfer which is why I would prefer to not have to run the whole restore again and just pick up the changes.
Thanks

Trying to mate a TM backup to a new computer is an exercise in futility, IMO. See http://discussions.apple.com/thread.jspa?messageID=1872713 for caveats upgrading a PPC (your G5) to an ICBM (Intel-chip-based Mac). SuperDuper!, Carbon Copy Cloner, Disk Utility, etc. can create a bootable backup/clone of your existing system to an external, bootable FireWire (recommended)/USB 2 external HD (usable with the new machine, but won't boot the old one, and is about 40% slower than FW). Once that's finished and tested to ensure it looks and acts as the original, just walk it over to the new machine, boot it up, and use the Migration Assistant to move your stuff, as described in the above link.
What I just did with a new 24"iMac and transfer stuff from a G4 (which was running Leopard) was to initially boot the machine, enter the same username/password combo, internet settings, and finish up. When the machine pops up the Desktop, Software Update will run an offer a host of updates. DON'T install them, but go to System Preferences, launch SU, and disable its auto-check and install option. That comes later. Then, I manually transferred my G4's user folder to the iMac's Desktop. Next, I started moving stuff from that folder into its appropriate places in the new user's folder. For instance, I replaced the current login.keychain with the former (thus bringing over all previously saved username/password combos), replaced the new Safari folder with the old (preserving all bookmarks, history, etc.), replaced the cookies.plist in Cookies, all preference files (except those in the ByHosts subfolder), merged everything in the other Library folders, mergee\d the Documents, Desktop, Music,Movies, and Pictures folders.
Launched System Preferences and opened each prefPane, checking and modifying as necessary. Note that one significant change is the mouse—the iMac ships with a Mighty Mouse, which has many new functions over the previous single-button mouse. Once that was finished, I restarted, repaired permissions, launched Safari to ensure it workedjust like the old versioni, checked e-mail (I use Eudora), and when I was satisfied everything was working as intended, I made another clone, so I could forego the previous if something went wrong. Note that many Dock icons will showup as plain files with a question mark (since you haven't installed the missing 3rd-party items—just ignore that—but they will identify what they should be pointing to.
After recloning, launched Software Update and let it install everything, except the Time Machine and Airport updates, since I don't use them, and repaired permissions. After ensuring that everything worked as expected, I updated the second clone, launched the Migration Assistant.app, only selected applications, and migrated them. Next, I replaced the ? Dock icons with their real aliases, launched each to ensrure they worked, restarted, and did one more permissions repair.
The only complication I ran across was that QuickTime lost its Pro registration information, so I had to putit back in. About the only thing that ran on my old machine under Tiger runs under Leopard, but I've been updating them for the past 20 months while beta-testing Leopard. AppleWorks 6.2.9, Quicken 2005-07, Eudoira 5.2.1, MS Office 2004, TurboTax 07, and just about everything except Unsanity's haxies (nonbetas) runs under Leopard.

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