I think the rule would be if you can stick to your one network port, your own power board as well as not take up more than 1 person's worth of space then you should be fine.
I think your network port is where you are going to run into trouble. You will have to ask one of the admins (maybe pm them or join the irc channel) as the rules pretty clearly state that you only get one (unles you ask nicely)
http://respawn.com.au/?page=guides.tandcQUOTE
Respawn provides one network port, and power sufficient for these devices for each paying entrant. Should anyone wish to bring two PC's, or additional equipment, they may be asked to pay a surcharge at the discretion of management.
Hope this helped.