@Pedro *********
-Jomtien requires a minimum of 15 days left on your current stamp to apply for the initial 90 day Non-O,
They also require the 800K baht in the bank account for 2 months prior to you applying for the 90 day Non-O visa too (not just when you go for the year extension)
-you can apply for the year extension at the Jomtien office when you have 30 days or less left on the Non-O 90 day stamp.
-the day you apply for the year extension you leave the passport there and go back the next day to pick it up <- that's when you buy your re-entry permit too