G'day Jade,
Great to see another Hobartian camper trailer family. Your philosophy is pretty much the same as ours, start out with something more affordable "read: cheap", modify & upgrade when circumstances allow. Looks like you've got a pretty good start, we started our CT journey last year with a basic second hand Cavalier CT (made in Sth Oz) & have done some mods since, with more in the pipeline.
Cheers,
Paul & Helen
aka The Nats