Thats great. Ubon fine the Landlord too. I think also with the new head of Immigration in place now this will slowely be brought back into line too according to national policy.
Within 24 Hours of a Foreignor living in a Property the owner of the House where the Foreignor is staying must complete a TM30 - Also if you stay away from the House where you are Registered for more than 24 Hours upon your return the House Owner must complete a TM30 at the Local Immigration Centre
Remember. There must be a reason for her to need to return to Thailand and you must clearly show that in the supporting letter. Whether she has children, owns Land or has a full time job. Marrying you is not enough.
With regards to your visa you can obtain a Multi Entry "Non Imm O" with an extension of Stay based on Marriage at Sawanaket, Lao, currently without any proof of funds. Show them the Marriage Certificate and supporting letter behind, Your Wifes House Book and ID Card and your Passport. If you can keep 400K Thai Baht in a Thai Bank Account for at least 2 Months prior to your application you can go to a local Immigration Office in the Province where you will live and apply for a Multi Entry Non Imm O Visa based on an Extention of Stay for marriage so you will not need to leave Thailand at all for a 12 Month period.
To get married in Thailand please follow this Website. If you have ever been married before please bring with you your original copy the Court issued you with of your Decree Absolute (Very Important).
Nothing is certain in Thailand at the moment as it's like Germany just before WWII.....So it's best to ensure you cover all basis and carry it on you like
Personally, as you are all Australian I would obtain METV's from The Thai Embassy there. You can make them work for 9 Months if you work them right then you could go to an adjoining Country after and apply for Tourist Visa's for the remainder of the time you are there. I would also ask your Embassy and give them the scenario as they maybe able to offer a better solution.
The Ministry of Labour is a Government Department. Immigration is not. Its one of many facets reporting to the head of the Royal Thai Police. The Government Department is a higher authority and we should listen to that. If there is an issue we can always instruct a Lawyer.