Hi there! YAY congratulations on getting into the GC birth centre! its lovely in there!
Im birthing this next bub at the Royal Brissie birth centre and they said they welcome doulas in there

you will find that they will love to see you with a very supportive persone helping them give you a lovely birth experiance. if your unsure ask them if they have a policy on doulas and what your middy thinks of it.