IP over FW and Internet Sharing

I currently have 2 ethernet connections here at my office, one for my G5 and one for my personal PB which I more or less use as an external when at the lab, which has an imap server for email archiving, etc.
I'm moving to another office where I'll likely have only a single connection. I may be able to agree with the network department to connect through a small switch, but that's not sure. So I'm looking into connecting the PB via FireWire, and would like to have some feedback on how to accomplish this in the best way, and what are the pitfalls.
So. Current IPs are in the 192.168.5.x range, 'served' by what is referred to as a VLAN. I noticed that when I make a dial-up connection from the PB without unhooking it from the local ethernet, I can still see the 192.168.5.x range and go outside over the dial-up connection. In other words, OS X seems to configure the gateways (routing table) automatically to act as a sort of router.
0) When I configure IP on FW, can the FW interface still be used for accessing hard disks and the like?
1) What address or address range do I specify for the FW interface on both machines? Is it easier to just pick an (unused!) 192.168.5.x address on the G5's fw0, and another one (e.g. my own) on the PB's fw0? Or is it better (safer) to pick an unrelated range?
2) For completeness: I suppose that I cannot specify the same address on the PB's en0 and fw0? If I can, it would avoid having to edit /etc/hosts .
3) How about the routers? I would guess that on the PB, I give the G5's fw0 address as the default router for the fw0 interface? And what do I do on the G5 in order to access the PB?
4) Is there a constraint on the length of the FW cable??
Those are all relevant issues I can think of right now, thanks in advance!
René

Yes, I've seen the cure in this particular Forum some months ago, (unfortunately I didn't bookmark it!).
If it helps, the pseudo router in the Mac always hands out x.x.2.x addies, which has been a bugaboo if you had any other x.x.2.x device in the mix, somewhere a few months after that discovery, some Guru here posted exactly what you need... sorry I can't help you more!

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