What is the process for applying for a 12-month extension of stay based on marriage in Thailand?

Thanks in advance for the advice! I am located in Chiang Mai, earlier this year I was on a yearly Non-B Visa Extension for work canceled May 1st. I then went onto amnesty and in August I received a 60-day family extension which expires November 26th based on advice from this group.

I completed my wire transfer of 400,000 THB from the US to my Thai account on August 7th so I would like to apply for a 12-month extension of stay based on marriage on October 7th. I believe I have all the paperwork in order for the extension but I would like to confirm the process of getting the extension as it is my first time.

My understanding is that because I was previously on a long-term extension from a Non-B visa I don’t need to apply for a change to a Non-O visa and I can apply for a 12-month extension based on marriage.

- When I apply for the 12-month extension based on marriage on October 7th will I receive a 1 month under consideration stamp and be asked to come back November 7th to get the remaining 11 months stamped in? Would the 12-month extension begin October 7th the date I apply or November 26th the day my current extension ends?

- Should I expect to schedule a home visit sometime during that one month under consideration period on October 7th when I apply for the extension or will Immigration officers just show up at my home sometime during the under-consideration period?

- Also, do I need to maintain the 400,000 balance throughout the 1-month consideration period? I transferred about 450,000 THB and I haven’t touched it. Once I apply for the 12-month extension can I use some of the transferred money as long as the account doesn’t go below 400,000?

Thanks again. I appreciate the help.