I would assume the prince's castle because I couldn't imagine a dark evil villain's castle would be a welcoming sight for children as they walk into the park.
That could fit well in Frontierland.Here's my input as an Aussie citizen...
Instead of Main Street USA how about recreating one of the early century Australian mining towns? Here's some images of a museum/amusement park we have called Sovereign Hill for reference.
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Also keep in mind that Australians are big on thrill rides. The typical Big Thunder Mountain just doesn't cut it for us, not even the children. So if your main audience is going to be locals you may want to consider upsizing some of the attractions (Indiana Jones Adventure is a good level of thrill).
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