You could probably get an answer by emailing the folks at the Qantas Founders Outback Museum
- there's a contact email address at the bottom of the page.
I was lucky enough to be at Longreach when the 747 came in, and there was certainly a parking stand for it - but I can't recall if it was specifically built for VH
-EBQ, or if it was already there.
If you want more info, here is the thread I started at the time:
"So powerful is the light of unity that it can illuminate the whole earth." - Bahá'u'lláh