I'm shutting this post down. The OP is *NOT* in Thailand, and all of this "Extension of stay based on retirement"/ "Extension of Stay based on marriage" may NOT be relevant to the OP when he arrives.
1. Entering Thailand is somewhat easy. Getting OUT OF Aus is extremely difficult. You're better off asking HOW to exit Aus and enter Thailand at this group here:
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I recommend applying for the visa about 2 months before you plan on coming over.
2. Getting a visa, and getting an extension of stay, are two completely different concepts. You can get an extension of stay AFTER you enter Thailand (where you have to show the 65K THB a month/ 40K THB a month for the retirement and marriage extension, respectfully). You'll get your extension of stay about 2 months after you arrive in Thailand.
My advice: Contact your local Thai embassy for the requirements of getting a Non-O visa based on marriage when the time is correct; and to ask your question when the time is close for you arrive.
In the meantime, I'm closing comments. If you need more information, send a message.
Thanks one and all.