Now that we have the new property I don't need a special orchard because (we hope) it should be frost free. The reason we have such terrible frost here is that the house and garden are quite low down the hill. Our neighbours at the top of the hill have no frost and grow bananas up there! So we hope (and have been told) that with the new property being on top of a hill it will also be frost free, so I should be able to just plant a nice orchard in the house yard and not worry about frost or containers.
Anyway, when I was planning for my container orchard, I found some useful information here and here, so that may help others with weird climates to start an orchard. In the meantime, I now own two container citrus plants, a lemon and a lime. And I can keep them in the pots until we move, so its still a useful idea for people who are renting or not sure if they'll be staying long at their current house. I won't get all the fruit trees that I was originally planning for the container orchard, but citrus is so useful, I thought it would be worth a try.
I got these trees from the Nanango market from a stall called Mountain Veiws Nursery from Pomona on the Sunshine Coast. They told me that they breed their own special dwarf root stock and specialise in citrus, so I am hoping that these trees are prepared for local conditions.
I'm looking forward to having access to my own lemons and limes for making ginger ale, and all those times you just need a squeeze of lemon!