Hi I'm not sure of any members here or on the FB page from Tazmania.
Cyclekarting is very much still in its infancy on our shores.
The best thing I can suggest is get stuck in and build one and others will follow.
I was in Tasmania recently. I saw a guy have something that looked like a cyclecart. I wouldn't say it was anything special, but I was interested. Shame I didn't take a picture of it. I believe that cyclecart is much more common among the handyman community. It's just that not everyone sits on the forums.