Can PPC and Intel OS's be on the same hard drive?

I do a lot of work on Apple computers for clients.
I have made it a habit to bring firewire hard drives with OS X installed to my work locations so I can boot peoples' computers from my own, clean OS for numerous troubleshooting purposes.
I was hoping to take a big hard drive I have, partition it into 4 parts, and install 10.4 Intel, 10.4 PPC, 10.5 Intel, and 10.5 PPC.
But after I installed the PPC 10.4, I went to my macbook pro and tried to install 10.5 Intel.....and it wouldn't let me!
So now I am learning about the Apple Partition Map format for a drive versus the GUID format and that basically one is for PPC and the other for Intel.
But I would like to know if there is any way to format a drive in such a way that I can indeed install PPC and Intel version of an OS onto one physical drive in separate partitions???
anyone?

It's not intuitive but it's possible. You must set up your external drive using the APT partition map. Install the PPC version of OS X on one partition. Now here's the trick: You must install an Intel version of Leopard on a drive that has been partitioned using GPT. Then clone that installed version to another partition the external drive that now has the PPC version of Leopard. You now have a PPC version of Leopard on one partition and in Intel version on the other partition. You will find you can boot an Intel Mac from that partition even though the drive is partitioned APT.
The problem is that Leopard will not allow itself to be installed on an APT partitioned drive. But an Intel version of Leopard will work just fine from an APT partitioned drive.

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