You could use one of them in Target Disk mode via firewire. It’s not probably the answer to your configuration requirements for your shoot but I wanted to make you aware of it.
How to use FireWire target disk mode
https://docs.info.apple.com/article.html?artnum=58583
Please note also that Powerbook drives come in 40, 60 and 100 GB sizes which will probably limit the amount of DV footage you can capture since there are applications and data already on the Powerbook you put in Target Disk mode. A rule of thumb is that you get 7 hours of DV footage per 100 GB of harddrive space.
HTH,
Bryce
PS You could use two external firewire drives and network the 2 Powerbooks together and then sync/copy the files to you main external firewire drive for editing during setups between shots. If the Powerbooks have Gigaethernet it should be an overly burdensome transfer time.
Don’t worry Mr. B. I have a cunning plan…
PowerBook 1.67 Ghz ATI 9700 128 MB 2 GB
Final Cut Pro HD
DVD Studio Pro 3
Motion