DVD-Less Install of Leopard on PPC

I have an old PPC G5 Mac (2004) which I wanted to clean up and re-install Leopard (OSX 10.5.8) on it so that it would be as good as new.  The only problem that I had was that the Leopard Install disk, for some reason, the iMac wont read. I did have an external DVD drive so I could read the disk on the machine though.

Since this is a PowerPC Mac, the option of booting off the external USB DVD ROM is not possible, so here are the steps I used to install a new version of OSX 10.6 on the iMac.

Overview:

1. Create a new partition on the boot disk
2. create the DVD image
3. copy the DVD image onto the new parition
4. select that as the start disk
5. restart the iMac and install onto the other partition.

• The new partition on the boot disk needs to be performed in 2 steps.  Whenever I tried to split the existing partition and create a new one, it always failed.  Open Disk utility and select the main disk on the Left Hand menu.  This is the "parent" of the hard disk.  In my case it is "149.1GB WDC..."

• Click 'Partition' and then Change the current selection from 1 to 2.  Then select the new partition and change the size to 10GB and it's name to something better;  I chose 'Image".  Select Apply and wait for the change to occur.

• Now it's time to create the disk image of the Leopard install disk.  In this case I'm using an external drive and insert the Leopard disk into that.  If you already have a DMB file of the install disk, you can skip these steps obviously. 
• Start up Disk utility with the DVD installed

• Go to the menu on the left and highlight the name of the disk you mounted.
• Click on the File menu at the top of the screen. From the drop-down menu, click New, then Disk Image From [name of your disk].

• Save the image on the desktop and select the type as 'read only'

• When finished, the DMG file will be on the desktop and also appear in the left hand pane.

• Now click on the 'Restore' Tab of Disk Utility

• Drag the Image file from the desktop onto the 'Source' Box.

• Drag the 'Image' Partition created earlier onto the Destination Box.

• Click on 'Restore' to copy the image onto the partition.  Click through the dialog boxes and enter your password when prompted.  At this point an error dialog may appear about not being able to usethe image.  If this occurs, select 'Images' -> 'Scan Image for Restore' and select the DMG file on the desktop.  Then repeat the step and it should work.
• Once the process is complete, exit Disk Utility and open System Preferences and go to 'Startup Disk'.  Select the disk image just created, then click restart.  Click through the dialog boxes, and your mac will shutdown and boot up the Leopard Install disk.  Follow through the normal install process and a pristine version of Leopard will be installed.