Decades ago friends called me to a MAJOR outbreak of Metura elongatus in their inner urban (Melbourne) garden. I presumed the winds had not been suitable for ballooning when the larva hatched. At the narrow side of the house were - literally hundreds of the large case caterpillars. The only plants available were Hardenbergia violacea which they had utterly defoliated and stripped, they had then had to move to eating nearby sedge plants. Their cases were a bit odd as a result of available building materials. I relocated buckets of them. I am not sure if I succeeded - my friend had started jumping on them so at least they had a chance. I also collected one, another time, living on Strelitzia sp. - interesting case there too. No Don, I did not successfully raise these through. I don't think I have ever seen the moth, just the fabulous orange and brown larvae.
They were initially making there houses out of the Hardenbergia violacea but when that ran (was eaten) out they were forced to use the only vegetation available - sedge tussocks - for housing. I suspect this was pre-digital so my photos are way less available (currently residing in Melbourne in slide boxes). BUT I have (MAYBE???) just posted 2 sightings of the 2 individuals I found on a Strelitzia sp. - date 24June2008. Assuming the records have gone up. I am having problems with NM. RE cases what I am saying is the caterpillar uses whatever material is available to it - if it is not it's preferred small sticks it can fashion to its specifications.
I was wondering if there were two species, one tidy and one untidy, but I guess it is just early instars attach anything, but get fastidious as they mature.
I know Ethan Beaver was looking for a different one M. phyllosacca which seems to have a "messier" case but iNat records only extend as far south as Sydney