I wish you success if you decide to buy and ferry.
Having done two East bound I can tell you it is not worth the effort.
All is fine until you hit Egyptian Airspace until you arrive in Broome or Darwin.
The Middle East and Asia all have one thing in common. They all believe in corruption and you are fair game.
Expect a handling fee of $US1000 per landing, then pay thru the nose for fuel, then parking charges then landing charges etc etc. All have nothing on Bankstown Airport charging just multiply by 10.
Machevelli is correct, get a professional ferry company to do it, go along if you feel the need for long distance ferrying.
I have another Aero Commander 685 in the states and have decided if it comes out to Australia then it will go across the Pacific.