It does sound odd that there are not more responses to your question of how many members are actually in the NT, or Darwin.

I am in Darwin as we speak, but not actively involved in any Astro stuff at the moment.
I meet Brian from up here last time i visited but have to admit do not know of any others.
I suppose the NT, is not the most favorable place to pursue this hobby, with its humidity, hot and wet conditions during the year.
I hope you enjoy your new scope.
Leon