Hi smudge,
Im sorry your prob fed up with my reply's my dad this my dad that but was just chatting to him and yes it was built there were 2 wind tunnels a low speed one which was dismantled and brought from Germany after the war and was used for aircraft development whilst the high speed one you mentioned was used in the development of the missile's program. It was situated away at the eastern end of queens island as it was a noisey piece of kit. I seem to remember guy warner had a pic and short article about it in one of his books about aircraft manufacturing in the north. Hope this fills in a few blanks.
Cheers k