Rough Costing

Fly to perth, Buy a car or caravan.
Pay for everything, drive to brisbane and sell.
Can sleep in the van or in tents wherever we drive, or find backpacker hostels along the way, say half the trip we camp out.

cost for EACH person:
FLy to perth $160
Buy/sell car/van (ie. buy car + repairs + fees - sell car) $2000/4=500
Petrol $1000/4=250
Sleep wherever or Hostel sometimes $40/night, half the time = 400
Try everything listed - A$1200
Eat $30/day = 600
Fly back from brisbane $200

Total 3500. Add another 500 for random stuff we buy or medicine or hospital etc.
$4k zhun zhun! ready set go!