What are the requirements for a one-year extension of a Non-O visa based on marriage after re-entering Thailand?

As far as what's required to apply for the extension there is no "one size fits all" list of documents. SO once you're here on your 90 day entry stamp head on over to your immigration office and get the hand out listing the requirements.

IF you're comin' in on a single entry 90 day Non-O visa that means the visa is used up when you enter and you're here on your 90 day entry stamp FROM that visa

Meaning when you have 30 days or less left on that 90 day entry stamp you go to the immigration office and apply for a year extension of stay based on marriage to a thai.

You need to meet the proof of funds (400K baht in a thai bank account in your name only for 2 months before you apply for your year extension). You'll apply, pay the 1900baht, get a 30 day under consideration stamp and then when that runs out you go back to get the year extension inked in.

Here's a pro tip (and you need to take it to heart)

NEVER EVER trust an embassy official outside thailand at a consulate about anything to do with a visa/extension once you're inside thailand

AND

NEVER EVER trust an immigration officer inside thailand at an immigration office about anything to do with a visa from outside of thailand