With differing processors you will need to make two different clones...
Here's what I'd do, here's what I actually do...
On one Mac that's PPC, you build an install that is rock solid, all the apps, updates, utilities etc.
One one Mac that's an ICBM (Intel Chip Base Mac - just my little joke) build another rock solid install. The only real difference will be OS and updates, most applications will be universal, so that bit should just be the same install. I realise you only have one ICBM.
Once you have that sorted you hopefully have an external Hard Drive handy...
Partition it it equally, and then clone the install from a PPC onto one partition and then clone the ICBM install.
For this you will need something like Carbon Copy Cloner -
http://www.bombich.com/software/ccc.html
Then connect the external to each Mac in turn, hopefully via Firewire. Restart each mach with the drive attached and hold don the 'alt key' this will force the Mac to look for any available boot partition. Once the Mac stops looking select the drive with the relevant build on it and start up from that. Once booted, launch Carbon Copy Cloner again and clone in the the other direction from the external to the machine.
This will overwrite anything on the machine you're cloning to. Back up personal files or anything stored locally.
With this method you should be able to update all the machines in a relatively short space of time without disrupting production too much. Less than a day after you've got a good install to clone from
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