Nice bikes, particularly like the chopper. Any plans to decorate the "tank" section? Nice bit of blank canvas there screaming for some custom airbrushing or something.
Can't help you with the clubs, unfortunately bikes like these don't seem to have a huge following anywhere in Aus except Adelaide.
Checkout the Biking Brisbane website, I believe there are a few events on at the moment. Seems like it's geared more toward track & retro but you never know where you might find more people that share your interests in something a bit different.
http://bikingbrisbane.com/