The site owners introduced a new set of rules for their walk-on for the new year and they can be found at this link:
http://walkonzone.com/vboard/showthread.php?t=16024
Don't be put off by the rate of fire or limited paint rules as it makes for one challenging day yet fun day! When you do move down here, definitely give it a try, you may really like it!
Another thing, that I find to be good, is that the walk-on site is separate from the 'punter' site which, although sounds a little harsh, means there isn't any uncomfortable 'mingling'.
Just to answer synergy's question, usually there are between 30-60+ people going to walk-on. It varies depending on the time of year and what not!