RE: RC multihulls?
One of my "mentors" who was instrumental in helping me set up the F-48's up here is Alan Hayes. Alan hosts the Kiwi website and offers a forum that seems populated by some of your fellow countrymen. Alan has a wonderful looking/sailing GHOST TRAIN (currently up for sail) and there are a few other Mini40's (same size as the F-48 at 1.2 meters) and also a group on the multihull forum that are into 800 mm size smaller trimarans. As for cats, as mentioned, not many of them around - anywhere!
Here is the forum address and from there you can get to the home page, and then a contact page for Alan. I am willing to bet he will be helpful to you too, and can fill you in on the interest in multihulls down there.
Good luck !
[link=http://kiwitalk.radioyachting.com/phpBB2/viewforum.php?f=12]Kiwi Radio Yachting[/link]