Because of a incomptability between the boot ROM on the shipping OS X Server 10.2.0, and the latest G4 FW800, I was facing serious problems trying to install or even boot from the install CD. The following information is a combination of two Apple KBase articles: 107496 and 107124.
First install an OS X Client (minimum version 10.2.3). Be careful to choose a login name no longer than eight characters, because that is the maximum OS X Server allows. Then follow these steps to enable an install of an older OS X Server over a newer OS X Client. Start up normally from the target computer's Mac OS X startup disk, and log in as an Admin user. Then open Terminal (in /Applications/Utilities/) and type:
% sudo mkdir /Library/Receipts/Previous_Receipts % sudo mv /Library/Receipts/French.pkg \ /Library/Receipts/Previous_Receipts/ % sudo mv /Library/Receipts/German.pkg \ /Library/Receipts/Previous_Receipts/ % sudo mv /Library/Receipts/Japanese.pkg \ /Library/Receipts/Previous_Receipts/ % sudo mv /Library/Receipts/BSD.pkg \ /Library/Receipts/Previous_Receipts/When you're done, quit the Terminal. Now install the Server without booting from the Install CD by opening "MacOSXServerInstall.mpkg" inside the "MacOSXServerInstall" directory. There you go!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030710112355333