@Andrew ****
I just went for this extension yesterday, I came back into Thailand 5th Jan on visa 30 day free. Immigration yesterday told me I will need another 30 day visa free extension, then once I have 15 days left on it, so in two weeks, I go back and they will give me a 60 day ext to visit Thai wife. Then once I have 15 days left on that I can get the ext for 1 year based on marriage. I was told I have to keep my 400k in the bank now for the next 90 days just to make sure there are no problems
You need to have 15 days or more left on your current entry visa apparently to get the ext based on marriage which I didn't know so I have to do it this way