@Dan ******
for a yearly extension based on marriage to a thai using banked money method you show 400K baht in a thai bank account in your name only for 2 months before you apply for the yearly extension. <- and you do that every year for a new extension each year.
Once the yearly extension issued you are free to use the funds as you see fit as long as it's back in the account 2 months before you apply for the extension the next year